CN109724765B

CN109724765B - Shooting system and method for high-speed wind tunnel serialization flow image

Info

Publication number: CN109724765B
Application number: CN201910190945.7A
Authority: CN
Inventors: 何霖
Original assignee: National University of Defense Technology
Current assignee: National University of Defense Technology
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2024-03-22
Anticipated expiration: 2039-03-13
Also published as: CN109724765A

Abstract

The invention discloses a shooting system and a shooting method for a high-speed wind tunnel serialized flow image, which are used for shooting images of high-speed turbulence in a wind tunnel experimental cabin, which change with time, the system is used for emitting a plurality of lasers to illuminate a high-speed wind tunnel flow field for multiple times through at least two lasers, each CCD camera in the at least two CCD cameras is used for exposing at least twice, each CCD camera is used for shooting trace particles in the high-speed wind tunnel flow field when illuminating the high-speed wind tunnel flow field for multiple times respectively, each CCD camera is used for exposing once to obtain an image of one trace particle, each CCD camera is used for exposing at least twice to obtain an image of at least two trace particles, and the system comprises at least two CCD cameras, so that the system can at least obtain images of four trace particles, and the technical problem that the prior art cannot obtain images of trace particles in the high-speed wind tunnel flow field which are related with more than two times is solved, and the technical effect of obtaining images of trace particles in the high-speed wind tunnel flow field which are related with at least four times is achieved.

Description

Shooting system and method for high-speed wind tunnel serialization flow image

Technical Field

The invention relates to the field of aerodynamics, in particular to a shooting system and method for a high-speed wind tunnel serialized flow image.

Background

The display and measurement of the supersonic and hypersonic flow field structures are very important contents in the research of supersonic and hypersonic flow mechanisms; in order to deeply study the supersonic and hypersonic flow mechanism, not only a space structure of supersonic and hypersonic flow at a certain moment is needed to be obtained, but also a flow structure change image (time evolution characteristic) at different moments is needed to be obtained, so that the development change rule of the flow structure along with time is studied, and a theoretical basis is provided for the design of a high-speed aircraft and the solution of related aerodynamic problems facing the design of the high-speed aircraft.

The traditional test technology capable of meeting the measurement of the time evolution characteristics of the supersonic and hypersonic flow field structures is a method for obtaining continuous images of the supersonic and hypersonic flow field structures by using a high-repetition-frequency laser light source in combination with a high-speed photographic camera; the second type is a method for obtaining continuous images of a supersonic and hypersonic flow field structure by adopting a multi-cavity laser and a hypersonic camera. However, in the first method, the high repetition frequency laser light source can emit light for multiple times (interval is of microsecond magnitude and the pulse number is tens of times) in a very short time, but the energy of single light emission is low, so that the trace particle scattering signal is weak, the flow field structure imaging signal to noise ratio is low, and a clear structure image cannot be obtained. For the second type of method, to realize that a plurality of lasers are connected in parallel with a technical implementation, the technical threshold is high, few mature commercial lasers can be purchased, and the ultra-high-speed camera and the special custom lasers are high in cost and limited by foreign banning.

Recently, widely adopted particle image velocity field techniques (Particle Image Velocimetry, PIV) have found mature applications in supersonic/hypersonic flow, mature test equipment, PIV systems are relatively inexpensive, but cannot obtain images of trace particles in more than two time-dependent high-speed wind tunnel flow fields.

Disclosure of Invention

The invention aims to provide a shooting system and a shooting method for a high-speed wind tunnel serialized flow image, which aim to obtain at least four images of trace particles in a time-dependent high-speed wind tunnel flow field.

In a first aspect, an embodiment of the present invention provides a capturing system for capturing a serial flow image of a high-speed wind tunnel, which is used for capturing images of a time-dependent change of high-speed turbulence in a wind tunnel experiment cabin, and the system includes:

a nanoparticle generator and a synchronous controller connected with each other; the synchronous controller is used for controlling the nanoparticle generator to throw nano-scale tracer particles into the high-speed wind tunnel flow field;

the system further comprises: at least two CCD cameras and at least two lasers connected with the synchronous controller;

the synchronous controller is also used for sequentially sending at least two control signals to the at least two lasers according to a first preset pulse time sequence after receiving the control instruction;

The at least two lasers are used for sequentially emitting a plurality of laser beams according to a second preset pulse time sequence after receiving the at least two control signals so as to illuminate the high-speed wind tunnel flow field for a plurality of times;

the synchronous controller is further used for controlling each CCD camera in the at least two CCD cameras to sequentially perform at least two exposures according to a third preset pulse time sequence so as to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and a plurality of images are respectively obtained.

Optionally, the system further comprises:

and the electronic equipment is connected with the synchronous controller and the at least two CCD cameras and is used for sending control instructions to the synchronous controller so as to control the synchronous controller to sequentially send at least two control signals according to a first preset pulse time sequence.

Optionally, the at least two CCD cameras are configured to sequentially send the plurality of images to the electronic device according to a fourth predetermined pulse timing sequence, so that the electronic device stores the plurality of images.

Optionally, the at least two lasers at least include a first laser and a second laser, and the at least two CCD cameras at least include a first CCD camera and a second CCD camera; the first laser, the second laser, the first CCD camera and the second CCD camera are connected with the synchronous controller; the at least two control signals comprise at least a first control signal and a second control signal;

The synchronous controller is specifically used for sending a first control signal to the first laser after receiving a control instruction;

the first laser is used for emitting first laser when the synchronous controller emits a first control signal for a first preset time so as to illuminate the high-speed wind tunnel flow field for the first time, and emitting second laser when the synchronous controller emits a second control signal for a second preset time so as to illuminate the high-speed wind tunnel flow field for the second time;

the synchronous controller is also used for sending a second control signal to the second laser after a third preset time passes after sending the first control signal;

the second laser is used for emitting third laser when the synchronous controller emits a second control signal for a first preset time so as to illuminate the high-speed wind tunnel flow field for the third time, and emitting fourth laser when the second laser passes through the second preset time so as to illuminate the high-speed wind tunnel flow field for the fourth time;

the synchronous controller is also used for controlling the first CCD camera to perform first exposure after sending a first control signal for a fourth preset time so as to shoot a first frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the first time; when the first CCD camera finishes the first exposure and a fifth preset time is passed, the first CCD camera is controlled to perform the second exposure so as to shoot a second frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the second time;

The synchronous controller is also used for controlling the second CCD camera to perform first exposure after a fourth preset time passes through when a second control signal is sent out so as to shoot a third frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the third time; and when the second CCD camera finishes the first exposure and passes a fifth preset time, controlling the second CCD camera to perform the second exposure so as to shoot a fourth frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the fourth time.

Optionally, the first CCD camera is further configured to transfer the first frame image to a register of the first CCD camera when the first exposure is completed, send the first frame image to the electronic device when the first exposure is completed for a sixth predetermined time, transfer the second frame image to the register of the first CCD camera when the first CCD camera completes the second exposure, and send the second frame image to the electronic device when the second exposure is completed for a seventh time; the second CCD camera is further configured to transfer the third image to a register of the second CCD camera when the second exposure is completed, send the third frame image to the electronic device when the second exposure is completed for a sixth predetermined time, transfer the fourth frame image to the register of the second CCD camera when the second exposure is completed, and send the fourth frame image to the electronic device when the seventh time is completed.

Optionally, the system further comprises: a beam combining device connected with the at least two lasers;

the beam combining device is used for spatially correcting a plurality of laser beams emitted by the at least two lasers so that the spatial positions of the illumination flow fields of the laser beams are the same.

Optionally, the system further comprises: a lens and a light arm;

the sheet optical lens is connected with the beam combining device through the optical arm;

the optical arm is used for transmitting the multiple laser beams after the beam combining device is corrected to the lens of the lens, and the lens of the lens is used for carrying out lens light on the multiple laser beams transmitted by the optical arm so that each laser beam diverges to form a lens light source with the thickness of 0.5 millimeter to illuminate the high-speed wind tunnel flow field.

Optionally, the system further comprises an optoelectronic shutter, and the optoelectronic shutter is connected with the synchronous controller; the synchronous controller is also used for controlling the closing of the photoelectric shutter when the first CCD camera performs the second exposure and obtains the second frame image so as to prevent light from reentering the first CCD camera.

Optionally, the at least two lasers further include a third laser, and the at least two CCD cameras further include a third CCD camera; the third laser and the third CCD camera are connected with the synchronous controller; the at least two control signals further comprise a third control signal;

The synchronous controller is further used for sending a third control signal to the third laser after a third preset time passes after sending the second control signal;

the third laser is used for emitting fifth laser when the synchronous controller emits a third control signal for a first preset time so as to realize fifth illumination of the high-speed wind tunnel flow field, and emitting sixth laser when the synchronous controller emits a second preset time so as to realize sixth illumination of the high-speed wind tunnel flow field;

the synchronous controller is also used for controlling the third CCD camera to perform first exposure after a third control signal is sent out for a fourth preset time so as to shoot a fifth frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the fifth time; and when the third CCD camera finishes the first exposure and passes a fifth preset time, controlling the third CCD camera to perform the second exposure so as to shoot a sixth frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the sixth time.

In a second aspect, an embodiment of the present invention provides a method for capturing a serial flow image of a high-speed wind tunnel, which is applied to any one of the systems described above, and after the synchronous controller controls the nanoparticle generator to deliver nanoscale tracer particles into the flow field of the high-speed wind tunnel, the method is characterized in that the method includes:

After receiving the control instruction, the synchronous controller sequentially sends at least two control signals to the at least two lasers according to a first preset pulse time sequence;

after receiving the at least two control signals, the at least two lasers sequentially emit a plurality of laser beams according to a second preset pulse time sequence so as to illuminate the high-speed wind tunnel flow field for a plurality of times;

and the synchronous controller controls each CCD camera in the at least two CCD cameras to sequentially perform at least two exposures according to a third preset pulse time sequence so as to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and a plurality of images are respectively obtained.

Compared with the prior art, the invention has the following beneficial effects:

the embodiment of the invention provides a shooting system and a shooting method for high-speed wind tunnel serialized flow images, which are used for shooting images of time-dependent changes of high-speed turbulence in a wind tunnel experimental cabin, wherein the system comprises the following components: a nanoparticle generator and a synchronous controller connected with each other; the synchronous controller is used for controlling the nanoparticle generator to throw nano-scale tracer particles into the high-speed wind tunnel flow field; the system further comprises: at least two CCD cameras and at least two lasers connected with the synchronous controller; the synchronous controller is also used for sequentially sending at least two control signals to the at least two lasers according to a first preset pulse time sequence after receiving the control command; the at least two lasers are used for sequentially emitting a plurality of laser beams according to a second preset pulse time sequence after receiving at least two control signals so as to illuminate the high-speed wind tunnel flow field for multiple times; the synchronous controller is also used for controlling each CCD camera in the at least two CCD cameras to sequentially perform at least two exposures according to a third preset pulse time sequence so as to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and a plurality of images are respectively obtained. At least two lasers emit multiple beams of laser light to illuminate the high-speed wind tunnel flow field for multiple times, each CCD camera in the at least two CCD cameras performs at least two exposures to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, each CCD camera performs one exposure to obtain an image of one trace particle, then each CCD camera performs at least two exposures to obtain images of at least two trace particles, the system comprises at least two CCD cameras, and then the system can at least obtain images of four trace particles. Therefore, the technical problem that more than two images of the trace particles in the time-related high-speed wind tunnel flow field cannot be obtained in the prior art is solved, and the technical effect of obtaining at least four images of the trace particles in the time-related high-speed wind tunnel flow field is achieved.

Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic block diagram of a capturing system 100 for serializing a flow image in a high-speed wind tunnel according to an embodiment of the present invention.

Fig. 2 shows a timing chart of shooting control of a high-speed wind tunnel serialized streaming image according to an embodiment of the present invention.

Fig. 3 shows a flowchart of a method for capturing a high-speed wind tunnel serialized streaming image according to an embodiment of the present invention.

Fig. 4 shows a flowchart of another method for capturing a serial flow image of a high-speed wind tunnel according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

For the measurement of the spatial structure of supersonic and hypersonic flow, the existing main methods include schlieren, shadow, interference, filter Rayleigh Scattering (FRS), laser induced fluorescence (PLIF) and the like (Fan Jiechuan, modern flow display technology, national defense industry Press, 2002). The supersonic flow structure has obvious three-dimensional characteristics, and methods such as schlieren, shadow and interference are only suitable for measuring two-dimensional or axisymmetric flow, so that the technology is limited in measuring the supersonic three-dimensional flow structure. FRS and PLIF technologies can realize measurement of three-dimensional flow structures, but the technologies have the defects of low image signal-to-noise ratio, low image spatial resolution and the like, and cannot meet the requirements of measuring three-dimensional fine structures of supersonic and hypersonic flow. The article "nanoparticle-based supersonic flow imaging" (Zhao Yuxin et al, chinese science E, technical science, 2009, 39 (12)) proposes a method for measuring supersonic and hypersonic flow structures using nanoparticle tracer particles (referred to as NPLS technology for short). The technology can be used for measuring the three-dimensional flow field, has the characteristics of high signal to noise ratio, high spatial resolution and the like, and can meet the requirements of supersonic and hypersonic flow measurement.

For measuring the time evolution characteristics of a supersonic and hypersonic flow structure, the current experimental measurement method faces great challenges. Since the supersonic and hypersonic flow has the characteristic of high movement speed, the time interval between acquiring the related images is required to be small enough (generally in the order of microseconds) to acquire the serial flow images with time correlation. For an imaging system, a traditional low-speed camera cannot meet the measurement requirement at all, and a high-speed camera is a measuring device capable of acquiring series images with time intervals reaching microsecond magnitude, but the high-speed camera generally adopts a continuous light source for imaging, and because supersonic and hypersonic flows have large displacement motions within exposure time of microsecond magnitude, the acquired images are blurred, so that a flowing fine structure cannot be obtained. In addition, high speed cameras acquire serialized images at the expense of image resolution, which also makes high speed cameras incapable of acquiring flowing fine structures, the higher the imaging rate, the lower the resolution of a single image. The ultra-high-speed camera developed at present can acquire a plurality of images (8 images can be acquired by the current products) at extremely short time intervals while the resolution of the images is not reduced, but the cost of the products is very high, and most of the products belong to the overseas products which are forbidden to sell in China and are very difficult to purchase.

On the other hand, the supersonic and hypersonic air flows are colorless and transparent, so that visual measurement of a flow field is realized, and the traditional method is to add tiny particles to move along with the fluid, and perform flow field tracing display through the tiny particles, such as a smoke line method. For supersonic and hypersonic flow fields, micrometer-scale particles used for low-speed flow cannot meet the flow field tracing requirement because of the strong speed change flow field such as shock waves and the like, and the particle diameter is required to trace submicron or nanometer-scale particles. According to the particle scattering imaging principle, a strong illumination intensity is required for realizing the visual imaging of the particles with such small dimensions, and a high-energy pulse laser light source (a continuous laser light source cannot meet the requirement of high energy) is generally adopted at present. For the measurement of the time evolution characteristic of the flow field structure, multiple laser illumination (high repetition frequency) needs to be realized within a very short time interval, and meanwhile, the laser is ensured to have enough energy.

The current test technology capable of meeting the measurement of the time evolution characteristics of supersonic and hypersonic flow field structures is that a high-repetition-frequency laser light source is matched with a high-speed photographic camera to obtain a plurality of high-frequency continuous time sequence images; another type uses a multi-cavity laser in combination with a super-high speed camera to obtain multiple continuous time-series images at high frequencies.

However, for the mode of matching the high repetition frequency laser light source with the high-speed photographic camera, the high repetition frequency laser light source can emit light for multiple times (interval is of microsecond magnitude and the pulse number is tens of) in a very short time, but the energy of single light emission is low, so that trace particle scattering signals are weak, the imaging signal to noise ratio of a flow field structure is low, and a clear structural image cannot be obtained. For the mode of matching the multi-cavity laser with the ultra-high speed camera, the technical threshold is higher in the technical realization that a plurality of lasers are connected in parallel. Currently, few mature commercial lasers of this type are commercially available, typically custom lasers, but such custom lasers are expensive; in addition, the ultra-high-speed camera matched with the ultra-high-speed camera is also high in cost and limited by overseas banning.

Particle image velocity field technology (PIV) is currently widely used, which has found mature application in supersonic/hypersonic flow, but only two time dependent flow structure images are obtained. As mature test equipment, the PIV system has relatively low cost, so the development and realization of a system capable of acquiring a plurality of time-dependent flow field structure images are an effective way based on the existing PIV system.

The embodiment of the invention provides a shooting system and a shooting method for a high-speed wind tunnel serialized flow image, which are used for solving the technical problem that more than two time-related images of trace particles in a high-speed wind tunnel flow field cannot be obtained in the prior art.

Examples

The embodiment of the invention provides a shooting system for a high-speed wind tunnel serialized streaming image, as shown in fig. 1, the system comprises a nanoparticle generator 110 and a synchronous controller 120 which are connected with each other, and at least two CCD cameras 130 and at least two lasers 140 which are connected with the synchronous controller 120. The synchronous controller 120 is used for controlling the nanoparticle generator 110 to deliver nano-scale tracer particles into the high-speed wind tunnel flow field. The synchronization controller 120 is further configured to sequentially send at least two control signals to the at least two lasers 140 according to the first predetermined pulse timing after receiving the control command. The at least two lasers 140 are configured to sequentially emit a plurality of lasers according to a second predetermined pulse sequence after receiving the at least two control signals, so as to illuminate the high-speed wind tunnel flow field for multiple times. The synchronous controller 120 is further configured to control each of the at least two CCD cameras 130 to sequentially perform at least two exposures according to a third predetermined pulse timing sequence, so as to respectively capture trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and respectively obtain multiple images. In order to ensure that each of the at least two CCD cameras 130 obtains multiple images of the trace particles in the high-speed wind tunnel flow field, the synchronous controller 120 sequentially sends at least two control signals to the at least two lasers 140 according to a first predetermined pulse timing sequence after the nanoparticle generator 110 puts the trace particles of nanometer magnitude into the high-speed wind tunnel flow field.

By adopting the above scheme, in the shooting system 100 for sequencing flow images in a high-speed wind tunnel provided by the embodiment of the invention, after the nanoparticle generator 110 puts nano-scale tracer particles into the high-speed wind tunnel flow field, at least two lasers 140 emit a plurality of lasers to illuminate the high-speed wind tunnel flow field for multiple times, each CCD camera in the at least two CCD cameras 130 performs at least two exposures to respectively shoot the tracer particles in the high-speed wind tunnel flow field when illuminating the high-speed wind tunnel flow field for multiple times, each CCD camera performs one exposure to obtain an image of one tracer particle, each CCD camera performs at least two exposures to obtain images of at least two tracer particles, and the system comprises at least two CCD cameras 130, so that the system can at least obtain images of four tracer particles. The method solves the technical problem that more than two images of the trace particles in the time-related high-speed wind tunnel flow field cannot be obtained in the prior art, and achieves the technical effect of obtaining at least four images of the trace particles in the time-related high-speed wind tunnel flow field. Meanwhile, images of trace particles in a high-speed wind tunnel flow field are obtained through cooperation of at least two lasers 140 and at least two CCD cameras 130 with low price, so that the system cost is low, and the system efficiency is high through working time sequences of the at least two lasers 140 and the at least two CCD cameras 130 by the synchronous controller 120.

As an alternative embodiment, the system further comprises: the electronic device 150 is connected to the synchronous controller 120 and the at least two CCD cameras 130, and the electronic device 150 is configured to send a control command to the synchronous controller 120, so as to control the synchronous controller 120 to send at least two control signals sequentially according to a first predetermined pulse timing. Wherein the electronic device 150 comprises one or more modules stored within a computer. The electronic device 150 is further configured to send a control instruction to the synchronization controller 120, so that the synchronization controller 120 controls each of the at least two CCD cameras 130 to sequentially perform at least two exposures according to a third predetermined pulse timing. In an embodiment of the present invention, the electronic device 150 may be a computer, a tablet computer, or the like, and the electronic device 150 stores a control program, and controls the electronic device 150 to send a control instruction to the synchronization controller 120 and store an image through the control program.

The plurality of images refer to at least four images of trace particles in a time-dependent high-speed wind tunnel flow field, and after the plurality of images are obtained, the images need to be stored. As an alternative embodiment, at least two CCD cameras 130 are used to sequentially transmit the plurality of images to the electronic device 150 according to the fourth predetermined pulse timing, so that the electronic device 150 stores the plurality of images.

Wherein the first, second, third and fourth predetermined pulse timings are as shown in fig. 2.

As an alternative embodiment, the at least two lasers 140 include at least a first laser 141 and a second laser 142, the at least two CCD cameras 130 include at least a first CCD camera 131 and a second CCD camera 132, and the first laser 141, the second laser 142, the first CCD camera 131 and the second CCD camera 132 are connected to the synchronization controller 120, and the at least two control signals include at least a first control signal and a second control signal. The times at which the first control signal and the second control signal are issued constitute a first predetermined pulse timing, such as timing 1 in fig. 2. The first control signal and the second control signal are represented by signal a and signal b, respectively, in fig. 2. The time interval between the first control signal and the second control signal is represented by a first pulse time delay, where the first pulse time delay is determined by the characteristics of the circuit of the laser, and as an alternative implementation, the value of the first pulse time delay may be 200 microseconds.

The synchronization controller 120 is specifically configured to send a first control signal to the first laser 141 after receiving a control instruction, where the first laser 141 is configured to send a first laser to illuminate a high-speed wind tunnel flow field for a first time and send a second laser to illuminate the high-speed wind tunnel flow field for a second time after receiving the control instruction when the synchronization controller 120 sends the first control signal for a first preset time. The first preset time and the second preset time are respectively shown as time 1 and time 2 in fig. 2, and the time of emitting the first laser light and the second laser light forms a second predetermined pulse time sequence of the first laser 141, and as time sequence 2 in fig. 2, the time interval of emitting the first laser light and the second laser light is the first preset time, and may also be represented by a second pulse time delay, where the second pulse time delay is determined by the measured flow field movement speed, for example, the movement speed of the high-speed wind tunnel flow field described in the embodiment of the present application. As an alternative embodiment, the second pulse delay (first preset time) may take a value of 0.5 microseconds to 200 microseconds. As an alternative embodiment, time 1 and time 2 are equal.

The synchronization controller 120 is further configured to send a second control signal to the second laser 142 after a third preset time elapses after the first control signal is sent. The third preset time is the first pulse delay, and the third preset time is shown as time 3 in fig. 2, and is determined by the circuit diagrams of the first laser 141 and the second laser 142, and time 1 and time 2, specifically: third preset time=time 1+time 2+delay of the first laser 41-delay of the second laser 142, as an alternative embodiment, the value of the third preset time may be any value between 1 microsecond and 400 microsecond.

The second laser 142 is configured to emit a third laser to illuminate the high-speed wind tunnel flow field for a third time when the synchronization controller 120 emits the second control signal for a first preset time, and emit a fourth laser to illuminate the high-speed wind tunnel flow field for a fourth time after the second preset time. Here, the pulse timings at which the first laser 141 and the second laser 142 emit laser light are similar, and the second laser 142 emits a plurality of laser light in sequence in accordance with the second predetermined pulse timing of the second laser 142, the second predetermined pulse timing of the second laser 142 being as shown in timing 3 in fig. 2.

The synchronous controller 120 is further configured to control the first CCD camera 131 to perform a first exposure after sending a first control signal for a fourth preset time, so as to capture a first frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the first time; and when the first exposure of the first CCD camera 131 is finished and a fifth preset time is passed, controlling the first CCD camera 131 to perform a second exposure so as to shoot a second frame image of the tracer particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the second time. The exposure timing of the first CCD camera 131 is as shown in timing 4 of fig. 2, and the fourth preset time and the fifth preset time are as shown in timing 4 and timing 5 of fig. 2. The fourth preset time and the fifth preset time are determined by the camera parameters of the first CCD camera 131, and as an optional implementation manner, the value of the fourth preset time is an arbitrary value between 100 microseconds and 200 microseconds, and the value of the fifth preset time is an arbitrary value between 0.2 microseconds and 0.4 microseconds.

The synchronous controller 120 is further configured to control the second CCD camera 132 to perform a first exposure after a fourth preset time passes by sending a second control signal, so as to capture a third frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for a third time, and control the second CCD camera 132 to perform a second exposure when the fifth preset time passes by ending the first exposure by the second CCD camera 132, so as to capture a fourth frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for a fourth time. The exposure timing of the second CCD camera 132 is as shown in fig. 2 at timing 5, and timing 4 and timing 5 are similar, and timing 4 and timing 5 constitute a third predetermined pulse timing.

In obtaining the first frame image, the second frame image, the third frame image, and the fourth frame image, the first frame image, the second frame image, the third frame image, and the fourth frame image need to be sent to the electronic device 150 for storage, and specifically, the at least two CCD cameras 130 are configured to send the first frame image, the second frame image, the third frame image, and the fourth frame image to the electronic device 150 for storage in sequence according to a fourth predetermined pulse timing. Specifically, the first CCD camera 131 is further configured to transfer the first frame image to the register of the first CCD camera 131 when the first exposure is completed, send the first frame image to the electronic device 150 when the first exposure is completed for a sixth predetermined time, transfer the second frame image to the register of the first CCD camera 131 when the first CCD camera 131 completes the second exposure, and send the second frame image to the electronic device 150 when the first CCD camera 131 completes the seventh exposure. The second CCD camera 132 is further configured to transfer the third image to a register of the second CCD camera 132 when the second exposure is completed, send a third frame image to the electronic device 150 when the second exposure is completed for a sixth predetermined time, transfer the fourth image to the register of the second CCD camera 132 when the second exposure is completed by the second CCD camera 132, and send a fourth frame image to the electronic device 150 when the seventh time is completed by the second CCD camera 132. Wherein the sixth predetermined time and the seventh predetermined time are respectively shown as time 6 and time 7 in fig. 2, the first CCD image is transmitted to the electronic device 150 in accordance with a fourth predetermined pulse timing of the first CCD image, the second CCD image is transmitted to the electronic device 150 in accordance with a fourth predetermined pulse timing of the second CCD image, the fourth predetermined pulse timing of the first CCD image is shown as time 6 in fig. 2, and the fourth predetermined pulse timing of the second CCD image is shown as time 7 in fig. 2. Time 6 and time 7 are determined by the camera parameters of the second CCD camera 132, and specifically, time 6 and time 7 are the same as time 5, i.e., the values of time 6 and time 7 are each any one of 0.2 microseconds to 0.4 microseconds, and as an alternative embodiment, the values of the sixth predetermined time and the seventh predetermined time are each 0.3 microseconds.

If more frames of time-dependent images of trace particles in the high-speed wind tunnel flow field need to be obtained, the system comprises more CCD cameras and more lasers. As an alternative embodiment, the at least two lasers 140 further comprise a third laser 143, and the at least two CCD cameras 130 further comprise a third CCD camera 133; the third laser 143 and the third CCD camera 133 are connected to the synchronization controller 120, and the at least two control signals further include a third control signal. The third laser 143 sequentially emits two laser beams according to the second predetermined pulse timing sequence, the third CCD camera 133 sequentially performs two exposure according to the third predetermined pulse timing sequence, and sequentially sends two images acquired by the two exposure to the electronic device 150 for storage according to the fourth predetermined pulse timing sequence. The method comprises the following steps: the synchronization controller 120 is further configured to send a third control signal to the third laser 143 after a third preset time elapses after the second control signal is sent. The third laser 143 is configured to emit a fifth laser to illuminate the high-speed wind tunnel flow field for a fifth time when the synchronization controller 120 emits a third control signal for a first preset time, and emit a sixth laser to illuminate the high-speed wind tunnel flow field for a sixth time after the second preset time. The synchronous controller 120 is further configured to control the third CCD camera 133 to perform a first exposure after a fourth preset time elapses after the third control signal is sent, so as to capture a fifth frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for a fifth time; and when the fifth preset time passes after the first exposure of the third CCD camera 133 is finished, controlling the third CCD camera 133 to perform the second exposure so as to shoot a sixth frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the sixth time. In this way, when the system includes more than two CCD cameras and more than two lasers, the assembly and control modes of the first CCD camera 131, the second CCD camera 132, the third CCD camera 131, the first laser 141, the second laser 141, and the third laser 143 and the control modes are referred to above, so that multiple time-related images of the high-speed wind tunnel flow field can be obtained by matching multiple CCD cameras and multiple lasers. The foregoing has clearly described the principles and methods, and those skilled in the art may perform system assembly and control on two CCD cameras and more than two lasers according to the foregoing principles and methods, which are not described herein.

After the fifth frame image and the sixth frame image are obtained, the fifth frame image and the sixth frame image need to be sent to the electronic device 150 for storage, and specifically, the third CCD camera 133 is further configured to sequentially send the fifth frame image and the sixth frame image to the electronic device 150 for storage according to a fourth predetermined pulse timing. Specifically, the third CCD camera 133 is further configured to transfer the fifth image to the register of the third CCD camera 133 when the first exposure is completed, send the fifth frame image to the electronic device 150 when the second exposure is completed for a sixth predetermined time, transfer the sixth frame image to the register of the third CCD camera 133 when the third CCD camera 133 completes the second exposure, and send the sixth frame image to the electronic device 150 when the third CCD camera 133 completes the seventh exposure.

Wherein the second predetermined pulse timing, the third predetermined pulse timing, and the fourth predetermined pulse timing according to which the third CCD images are formed are respectively shown as timing 8, timing 9, and timing 10 in fig. 2.

In fig. 2, the first, second, and third CCD cameras 131, 132, and 133 are the camera 1, the camera 2, and the camera 3 in fig. 2, respectively. Camera 1, camera 2, and camera 3 may be cross-frame cameras. The first, second and third lasers 141, 142 and 143 are the lasers 1, 2 and 3 in fig. 2, respectively.

By adopting the scheme, 6 images of the trace particles in the high-speed wind tunnel flow field which are related in time can be obtained. If more time-related images of trace particles in the high-speed wind tunnel flow field are needed, more lasers and CCD cameras can be arranged, the number of the lasers and the CCD cameras corresponds to that of the lasers, and according to similar time sequences of the first CCD camera 131, the second CCD camera 132, the third CCD camera 133, the first laser 141, the second laser 142 and the third laser 143, for example, more CCD cameras and more lasers are controlled to work cooperatively, so that more time-related images of trace particles in the high-speed wind tunnel flow field can be obtained.

In order to reduce the influence of the illumination position of the illumination on the image quality, as an alternative embodiment, the system further comprises: and the beam combining device 160 is connected with the at least two lasers 140, and the beam combining device 160 is used for spatially correcting the multiple laser beams emitted by the at least two lasers 140 so that the spatial positions of the illumination flow fields of the multiple laser beams are the same. The multiple laser beams emitted by at least two lasers 140 are spatially corrected by the beam combining device 160, and the spatial positions of the multiple laser beam illumination flow fields are the same, so that the positions of trace particles in the multiple laser beam illumination high-speed wind tunnel flow fields are the same, the distortion of images shot by the CCD camera is reduced, and the quality of the obtained images is improved.

In order to reduce losses of the laser light during transmission, the system further comprises an optical arm 180, the optical arm 180 being adapted to transmit the laser light. In order to reduce the influence of the illumination balance on the image quality and improve the image quality, the system further comprises a lens 170, the lens 170 and the beam combining device 160 are connected through a light arm 180, the light arm 180 is used for transmitting a plurality of laser beams after the beam combining device 160 is corrected to the lens 170, and the lens 170 is used for performing lens light on the plurality of laser beams transmitted by the light arm 180, so that each laser beam diverges to form a lens light source with the thickness of 0.5 millimeter to illuminate a high-speed wind tunnel flow field. Each beam of laser diverges to form a sheet-shaped light source with the thickness of 0.5 millimeter to illuminate the high-speed wind tunnel flow field, so that the wind tunnel flow field has at least uniform illumination on the same plane, the illumination uniformity in the wind tunnel flow field is improved, the distortion of an image shot by the CCD camera is reduced, and the quality of the obtained image is improved.

In order to avoid that the third laser irradiates the second exposure time range of the first camera when imaging the high-speed wind tunnel flow field, and affects the quality of the second image acquired by the second exposure of the first camera, as an optional implementation manner, the system further includes an optoelectronic shutter, where the optoelectronic shutter is connected to the synchronization controller 120, and the synchronization controller 120 is further configured to control the optoelectronic shutter to close when the first CCD camera 131 completes the second exposure. Specifically, an optoelectronic shutter is additionally installed in front of the first CCD camera 131, and the optoelectronic shutter is closed before the third laser emits light under the control of the synchronous controller 120, so that the imaging is completed by the second exposure of the first CCD camera 131.

In summary, the system 100 for capturing a serial flow image of a high-speed wind tunnel according to the embodiment of the present invention includes: a nanoparticle generator 110 and a synchronous controller 120 connected to each other; the synchronous controller 120 is used for controlling the nanoparticle generator 110 to deliver nano-scale tracer particles into the high-speed wind tunnel flow field; the system further comprises: at least two CCD cameras 130 and at least two lasers 140 connected to the synchronization controller 120; the synchronization controller 120 is further configured to sequentially send at least two control signals to the at least two lasers 140 according to a first predetermined pulse timing sequence after receiving the control command; the at least two lasers 140 are used for sequentially emitting a plurality of laser beams according to a second preset pulse time sequence after receiving the at least two control signals so as to illuminate the high-speed wind tunnel flow field for a plurality of times; the synchronous controller 120 is further configured to control each of the at least two CCD cameras 130 to sequentially perform at least two exposures according to a third predetermined pulse sequence, so as to respectively capture trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and respectively obtain multiple images. At least two lasers 140 emit multiple beams of laser light to illuminate the high-speed wind tunnel flow field for multiple times, each CCD camera in the at least two CCD cameras 130 performs at least two exposures to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, each CCD camera performs one exposure to obtain an image of one trace particle, then each CCD camera performs at least two exposures to obtain an image of at least two trace particles, the system comprises at least two CCD cameras 130, and the system can at least obtain images of four trace particles. Therefore, the technical problem that more than two images of the trace particles in the time-related high-speed wind tunnel flow field cannot be obtained in the prior art is solved, and the technical effect of obtaining at least four images of the trace particles in the time-related high-speed wind tunnel flow field is achieved.

The embodiment of the present application further provides a method for capturing a high-speed wind tunnel serialized streaming image, which is applied to the system, and includes S100 to S300 shown in fig. 3. S100 to S300 are explained below with reference to fig. 3.

S100: after receiving the control command, the synchronization controller 120 sequentially sends at least two control signals to at least two lasers 140 according to a first predetermined pulse sequence.

S200: after receiving the at least two control signals, the at least two lasers 140 sequentially emit a plurality of lasers according to a second preset pulse time sequence so as to illuminate the high-speed wind tunnel flow field for multiple times.

S300: the synchronous controller 120 controls each of the at least two CCD cameras 130 to sequentially perform at least two exposures according to a third predetermined pulse time sequence, so as to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and respectively obtain multiple images.

By adopting the above scheme, at least two lasers 140 emit multiple beams of laser light to illuminate the high-speed wind tunnel flow field for multiple times, each CCD camera in at least two CCD cameras 130 performs at least two exposures to respectively shoot trace particles in the high-speed wind tunnel flow field when illuminating the high-speed wind tunnel flow field for multiple times, each CCD camera performs one exposure to obtain an image of one trace particle, then each CCD camera performs at least two exposures to obtain at least two images of trace particles, and at least two CCD cameras 130 can obtain at least four images of trace particles. Therefore, the technical problem that more than two images of the trace particles in the time-related high-speed wind tunnel flow field cannot be obtained in the prior art is solved, and the technical effect of obtaining at least four images of the trace particles in the time-related high-speed wind tunnel flow field is achieved.

As an alternative embodiment, the method further includes sending, by the electronic device 150, a control command to the synchronous controller 120 to control the synchronous controller 120 to send at least two control signals sequentially according to the first predetermined pulse timing.

As an alternative embodiment, the method further comprises: the at least two CCD cameras 130 are configured to sequentially transmit the plurality of images to the electronic device 150 according to a fourth predetermined pulse timing, so that the electronic device 150 stores the plurality of images.

As an alternative embodiment, the at least two lasers 140 include at least a first laser 141 and a second laser 142, and the at least two CCD cameras 130 include at least a first CCD camera 131 and a second CCD camera 132. The first laser 141, the second laser 142, the first CCD camera 131, and the second CCD camera 132 are connected to the synchronization controller 120. The at least two control signals include at least a first control signal and a second control signal. For S200 and S300, specifically: the synchronization controller 120 sends a first control signal to the first laser 141 after receiving a control command; the first laser 141 emits a first laser when the synchronization controller 120 emits a first control signal for a first preset time, so as to illuminate the high-speed wind tunnel flow field for the first time, and emits a second laser when the synchronization controller emits a second control signal for a second preset time, so as to illuminate the high-speed wind tunnel flow field for the second time. The synchronization controller 120 sends a second control signal to the second laser 142 after a third preset time elapses after sending the first control signal. The second laser 142 emits a third laser to illuminate the high-speed wind tunnel flow field for a third time when the synchronous controller 120 emits a second control signal for a first preset time, and emits a fourth laser to illuminate the high-speed wind tunnel flow field for a fourth time after the second preset time. After sending a first control signal for a fourth preset time, the synchronous controller 120 controls the first CCD camera 131 to perform a first exposure so as to shoot a first frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the first time; and when the first exposure of the first CCD camera 131 is finished and a fifth preset time is passed, controlling the first CCD camera 131 to perform a second exposure so as to shoot a second frame image of the tracer particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the second time. After a fourth preset time passes by the sending of the second control signal, the synchronous controller 120 controls the second CCD camera 132 to perform the first exposure so as to shoot a third frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the third time; and when the second CCD camera 132 performs the first exposure and the fifth preset time passes, controlling the second CCD camera 132 to perform the second exposure, so as to capture a fourth frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for a fourth time.

As an alternative embodiment, the method further comprises: the synchronization controller 120 transfers the first frame image to the register of the first CCD camera 131 when the first CCD camera 131 completes the first exposure, sends the first frame image to the electronic device 150 when the first CCD camera 131 completes the first exposure for a sixth predetermined time, transfers the second frame image to the register of the first CCD camera 131 when the first CCD camera 131 completes the second exposure, and sends the second frame image to the electronic device 150 when the first CCD camera 131 completes the second exposure for a seventh time. The second CCD camera 132 transfers the third image to the register of the second CCD camera 132 when the second exposure is completed, the second CCD camera 132 transmits the third frame image to the electronic device 150 when the second exposure is completed for a sixth predetermined time, the second CCD camera 132 transfers the fourth frame image to the register of the second CCD camera 132 when the second exposure is completed, and the second CCD camera 132 transmits the fourth frame image to the electronic device 150 when the second exposure is completed for a seventh time.

As an alternative embodiment, the at least two lasers 140 further comprise a third laser 143, and the at least two CCD cameras 130 further comprise a third CCD camera 133. The third laser 143 and the third CCD camera 133 are connected to the synchronization controller 120. The at least two control signals further comprise a third control signal. The method further comprises the steps of: the synchronization controller 120 sends a third control signal to the third laser 143 after a third preset time elapses after sending the second control signal. When the third laser 143 sends out the third control signal for a first preset time, the synchronous controller 120 sends out fifth laser to realize fifth illumination of the high-speed wind tunnel flow field, and after a second preset time, the third laser 143 sends out sixth laser to realize sixth illumination of the high-speed wind tunnel flow field. After a fourth preset time elapses after the synchronous controller 120 sends out a third control signal, the third CCD camera 133 is controlled to perform a first exposure, so as to capture a fifth frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for a fifth time; and when the third CCD camera 133 performs the first exposure and the fifth preset time passes, controlling the third CCD camera 133 to perform the second exposure, so as to capture a sixth frame image of the trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for a sixth time.

As an alternative embodiment, after the at least two CCD cameras 130 transmit at least four frames of images or multiple frames of graphics to the electronic device 150, the method further includes S400 as shown in fig. 4: and performing image correction processing on the multi-frame or at least four-frame images. The operation of performing the image correction processing on the multi-frame or at least four-frame image may be performed by the electronic device 150. Thus, imaging errors of multiple frames of images generated by position change of the CCD camera are eliminated, and finally multiple frames of time-related images are obtained.

The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, the present invention is not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functions of some or all of the components in an apparatus according to embodiments of the present invention may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present invention can also be implemented as an apparatus or device program (e.g., a computer program and a computer program product) for performing a portion or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.

Claims

1. A system for capturing high-speed wind tunnel serialized flow images for capturing images of high-speed turbulence within a wind tunnel experimental cabin over time, the system comprising:

a nanoparticle generator and a synchronous controller connected with each other; the synchronous controller is used for controlling the nanoparticle generator to throw nano-scale tracer particles into a high-speed wind tunnel flow field;

Characterized in that the system further comprises: at least two CCD cameras and at least two lasers connected with the synchronous controller;

the synchronous controller is further used for controlling each CCD camera in the at least two CCD cameras to sequentially perform at least two exposures according to a third preset pulse time sequence so as to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and respectively obtain multiple images; the at least two lasers at least comprise a first laser and a second laser, and the at least two CCD cameras at least comprise a first CCD camera and a second CCD camera; the first laser, the second laser, the first CCD camera and the second CCD camera are connected with the synchronous controller; the at least two control signals comprise at least a first control signal and a second control signal;

the first laser is used for emitting first laser when the synchronous controller emits a first control signal for a first preset time so as to illuminate the high-speed wind tunnel flow field for the first time, and emitting second laser when the synchronous controller emits a second control signal for a second preset time so as to illuminate the high-speed wind tunnel flow field for the second time; the time interval of the first laser and the second laser is determined by the movement speed of the high-speed wind tunnel flow field;

2. The system of claim 1, wherein the system further comprises:

3. The system of claim 2, wherein the at least two CCD cameras are configured to sequentially transmit the plurality of images to the electronic device in accordance with a fourth predetermined pulse sequence, so that the electronic device stores the plurality of images.

4. The system of claim 3, wherein the first CCD camera is further configured to transfer the first frame image to a register of the first CCD camera upon completion of a first exposure, transmit the first frame image to the electronic device upon completion of a first exposure for a sixth predetermined time, transfer the second frame image to a register of the first CCD camera upon completion of a second exposure, and transmit the second frame image to the electronic device upon completion of a second exposure for a seventh time; the second CCD camera is further configured to transfer the third frame image to a register of the second CCD camera when the first exposure is completed, send the third frame image to the electronic device when the first exposure is completed for a sixth predetermined time, transfer the fourth frame image to the register of the second CCD camera when the second exposure is completed, and send the fourth frame image to the electronic device when the seventh exposure is completed.

5. The system of claim 1, wherein the system further comprises: a beam combining device connected with the at least two lasers;

6. The system of claim 5, wherein the system further comprises: a lens and a light arm;

7. The system of claim 1, further comprising an optoelectronic shutter coupled to the synchronization controller; the synchronous controller is also used for controlling the closing of the photoelectric shutter when the first CCD camera performs the second exposure and obtains the second frame image so as to prevent light from reentering the first CCD camera.

8. The system of claim 1, wherein the at least two lasers further comprise a third laser, the at least two CCD cameras further comprising a third CCD camera; the third laser and the third CCD camera are connected with the synchronous controller; the at least two control signals further comprise a third control signal;

9. A method for shooting a high-speed wind tunnel serialized flow image, which is applied to the system of any one of claims 1-6, after the synchronous controller controls the nanoparticle generator to throw nano-scale tracer particles into a high-speed wind tunnel flow field, the method is characterized by comprising the following steps:

the synchronous controller controls each CCD camera of the at least two CCD cameras to sequentially expose at least twice according to a third preset pulse time sequence so as to respectively shoot trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for multiple times, and a plurality of images are respectively obtained; the at least two lasers at least comprise a first laser and a second laser, and the at least two CCD cameras at least comprise a first CCD camera and a second CCD camera; the first laser, the second laser, the first CCD camera and the second CCD camera are connected with the synchronous controller; the at least two control signals comprise at least a first control signal and a second control signal;

The synchronous controller sends a first control signal to the first laser after receiving a control instruction;

the first laser emits first laser when the synchronous controller emits a first control signal for a first preset time so as to illuminate the high-speed wind tunnel flow field for the first time, and emits second laser when the synchronous controller emits a second control signal for a second preset time so as to illuminate the high-speed wind tunnel flow field for the second time; the time interval of the first laser and the second laser is determined by the movement speed of the high-speed wind tunnel flow field;

the synchronous controller sends a second control signal to the second laser after a third preset time passes after sending the first control signal;

the second laser emits third laser when the synchronous controller emits a second control signal for a first preset time so as to illuminate the high-speed wind tunnel flow field for the third time, and emits fourth laser when the second laser emits a second control signal for the second preset time so as to illuminate the high-speed wind tunnel flow field for the fourth time;

after sending a first control signal for a fourth preset time, the synchronous controller controls the first CCD camera to perform first exposure so as to shoot a first frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the first time; when the first CCD camera finishes the first exposure and a fifth preset time is passed, the first CCD camera is controlled to perform the second exposure so as to shoot a second frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the second time;

After a second control signal is sent out and a fourth preset time passes, the synchronous controller controls the second CCD camera to perform first exposure so as to shoot a third frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the third time; and when the second CCD camera finishes the first exposure and passes a fifth preset time, controlling the second CCD camera to perform the second exposure so as to shoot a fourth frame image of trace particles in the high-speed wind tunnel flow field when the high-speed wind tunnel flow field is illuminated for the fourth time.