CN108761993A - A kind of restructural space frame imaging device - Google Patents
A kind of restructural space frame imaging device Download PDFInfo
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- CN108761993A CN108761993A CN201810938596.8A CN201810938596A CN108761993A CN 108761993 A CN108761993 A CN 108761993A CN 201810938596 A CN201810938596 A CN 201810938596A CN 108761993 A CN108761993 A CN 108761993A
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- G—PHYSICS
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- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
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Abstract
The present invention relates to a kind of restructural space frame imaging devices, belong to ultrafast technical field of imaging.Including collimating optical system, space divided beam system, filtering system, imaging receiver system and image capturing system；Target beam is after the collimating optical system enters the space divided beam system, by the space divided beam system array at the beamlet of the multi beam difference direction of propagation, each beamlet is by after the narrow-band filtering system filter, respectively by the imaging receiver system imaging on the different location of described image acquisition system, described image acquisition system receives the image of each beamlet and output.By using space divided beam system, being adjusted flexibly for system framing quantity is realized, the resetting difficulty and manufacturing cost of system is greatly reduced, system is made to have restructural characteristic.
Description
Technical field
The present invention relates to a kind of restructural space frame imaging devices, belong to ultrafast technical field of imaging.
Background technology
Compared to other high-speed imaging technologies, full light imaging technique can realize higher temporal resolution and spatial discrimination
Rate can realize ultrafast imaging.In the prior art, full light imaging technique include mainly based on pumping-detection technology it is ultrafast at
As technology, STAMP (Sequentially Timed All-optical Mapping P hotography, sequence time mapping
The complete ultrafast imaging of light) technology and SF-STAMP (Sequentially Ti med All-optical Mapping
Photography utilizing Spectral Filtering, sequence time based on spectral filtering map full light it is ultrafast at
Picture) technology.Ultrafast imaging technique based on pumping-detection technology, temporal resolution are determined by detecting optical pulses width, but are somebody's turn to do
Technology reappears the phenomenon in a complete cycle by the different fragments obtained in multiple periods, is only applicable to what acquisition repeated
Ultrafast phenomena is not used to capture single, irregular ultrafast phenomena.
STAMP technologies are most fast ultrafast imaging techniques of 2D in the world at present, can capture the ultrafast existing of subpicosecond magnitude
As, image quality is high, meanwhile, imaging mode is single outburst imaging, i.e., completes entire imaging process, energy by single pulse
It is enough in the ultrafast phenomena for capturing and being repeated such as the aperiodicity of explosion, cell interaction, enzyme reaction equiprobability or complexity.
But since the making of system periscope structure is complex, the framing quantity which realizes at present can only achieve 6 width.
In order to overcome the defect of framing lazy weight in STAMP technologies, SF-STAMP technologies to use DOE (Diffractive
Optical Elements, diffraction optical element) framing quantity has been increased to 25 width by structure, and temporal resolution reaches 133fs.
As shown in Figure 1, being SF-STAMP system structure diagrams, whole system is a 4f system, and described device includes that Fourier becomes
Change lens 1, DOE2, narrowband BPF (Band-pas s filter, bandpass filter) 3, imaging lens 4 and imaging sensor 5.It waits for
The front focal plane that object 6 is located at Fourier transform lens 1 is surveyed, DOE2 is located at the back focal plane of Fourier transform lens 1, is located at imaging lens
First 4 front focal plane.Chirped pulse detection light from object under test 6 passes through the spaces D OE2 by the collimation of Fourier transform lens 1
It is beamed into beamlet array, each beamlet continues to propagate with different angle；The opposite deflection of narrowband BPF3 and DOE2 make
Different beamlets are different with respect to the incidence angle of narrowband BPF3 so that each beamlet is after narrowband BPF3, respectively at
For the narrowband beamlet with different centre wavelengths；Later, filtered each beamlet respectively by imaging lens 4 simultaneously at
As on the different location of the imaging sensor 5 of 4 back focal plane of imaging lens.Setting in this way so that target different wave length
Image be recorded simultaneously on the different location of imaging sensor, realize single outburst imaging.
However, when realizing framing using DOE, the framing quantity of SF-STAMP systems is uniquely determined by selected DOE, can not
Adjustment；When needing to realize different framing quantity, it is necessary to different DOE is selected, and needs to re-start debugging after replacing DOE,
Expend a large amount of manpower and materials.Also, DOE needs to carry out specific customization, when in order to realize higher framing quantity, needs to customize
The price of DOE is prohibitively expensive, substantially increases the production and processing cost of system.
Generally use narrow-band filtering device is less than 1nm or so narrowband as narrow band filter in order to realize in the prior art
Filter function, the surface of narrow-band filtering device need to plate tunics up to a hundred, and processing technology is extremely complex, and production difficulty is very big, I
State at present still without ripe processing technology, related elements there is still a need for import, this also substantially increase the production and processing of system at
This, seriously limits the development of ultrafast imaging technique.
Invention content
The purpose of the present invention is to solve the prior arts there is a problem of that narrow application range and processing technology are complicated, provide
A kind of restructural space frame imaging device.The device framing quantity is adjustable, applied widely, under various operating conditions without
Element replacement need to be carried out, can effectively reduce the manufacturing and the use cost of system compared with the existing technology.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of restructural space frame imaging device, including：Collimating optical system, space divided beam system, filtering system,
Imaging receiver system and image capturing system.
Chirped pulse incident beam from object under test is after the collimating optical system, by space beam splitting system
System is divided into space in the multi beam beamlet of two-dimensional array distribution, after each beamlet is filtered by the filtering system, point
Not by the imaging receiver system imaging on the different location of described image acquisition system, the image-forming module receives each described
The picture of beamlet is simultaneously converted to picture signal output.
Further include light-dividing device, the light-dividing device is placed between collimating optical system and space divided beam system, and being used for will
It is divided into multi beam by the incident light of collimation so that a kind of framing number of restructural space frame imaging device provided by the invention
Amount is exponentially promoted.
Optionally, the filtering system is relative to the spatial position setting requirements of the space divided beam system：So that each
For beamlet when being incident on the filtering system, the incidence angle of different beamlets is different.
Optionally, it is provided with spatial position adjusting apparatus in the filtering system and/or the space divided beam system.
Optionally, the filtering system is narrow-band filtering device or FP cavity configurations.
Optionally, the FP cavity configurations narrow-band filtering device further includes the long adjusting apparatus of chamber.
Optionally, the beamlet array that the space divided beam system generates is rectangle beam splitting array.
Advantageous effect
A kind of restructural space frame imaging device provided by the invention, can arbitrarily be arranged framing number according to system requirements
Amount, splitting angle, beam splitting intensity etc. are not necessarily to adjustment again without replacing device so that system has restructural characteristic, is applicable in
Range is wide, greatly reduces system cost；It is rectangle by design space divided beam system beam splitting array, is meeting beamlet incidence
Under the premise of the difference of angle, the rotation angle debugging when divided beam system installation of space is avoided, system structure is simplified, reduces adjustment
Cost.
Description of the drawings
Fig. 1 is SF-STAMP system structure diagrams；
Fig. 2 is a kind of example structure schematic diagram of restructural space frame imaging device of the present invention；
Fig. 3 is a kind of embodiment light path schematic diagram of restructural space frame imaging device of the present invention；
Fig. 4 is square beam splitting array schematic diagram；
Fig. 5 is rectangle beam splitting array schematic diagram；
Fig. 6 is a kind of multichannel framing example structure schematic diagram of restructural space frame imaging device of the present invention；
Fig. 7 is a kind of framing result schematic diagram of the embodiment of restructural space frame imaging device of the present invention.
Wherein 1-Fourier transform lens, 2-DOE, 3-narrowband BPF, 4-imaging lens, 5-imaging sensors, 6-
Object under test, 7-collimating optical systems, 8-space divided beam systems, 9-filtering systems, 10-imaging receiver systems, 11-figures
As acquisition system.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
As shown in Fig. 2, for a kind of example structure signal of restructural space frame imaging device provided by the invention
Figure, please also refer to Fig. 3, for a kind of embodiment light path signal of restructural space frame imaging device provided by the invention
Figure.The restructural space frame imaging device includes collimating optical system 7, space divided beam system 8, filtering system 9, imaging
Reception system 10 and image capturing system 11, incident beam is after collimating optical system 7, if being divided by space divided beam system 8
Dry beam beamlet is imaged on figure by imaging receiver system 10 respectively after each filtered system 9 of beamlet filters in synchronization
As acquisition system 11 different location on, realize single outburst imaging.Image capturing system 11 receives the picture of each beamlet,
And be converted to picture signal output.
Collimating optical system 7 is for collimating target light so that the chirp light beam from target can become parallel incidence
Light beam enters space divided beam system 8.
Space divided beam system 8 is used to carry out space beam splitting to the incident beam, and incident beam beam splitting is become in space
In multiple beamlets that two-dimensional array is distributed, the spectrum of any beamlet is identical with the spectrum of incident beam.Space beam splitting
There is system 8 restructural characteristic may be implemented be changed without space beam splitting system by the parameter of reconstruction attractor divided beam system 8
Quantity, the intensity of each sub-light beam-emergence direction and each beamlet that beamlet is adjusted under conditions of system 8, to need to change group in nothing
Framing quantity, the temporal resolution etc. of a kind of restructural space frame imaging device are neatly adjusted in the case of part,
So that the restructural space frame imaging device disclosure satisfy that different framing numbers, the imaging demand of temporal resolution, fit
It is wide with range, it is easy to operate, without repeating adjustment.
Filtering system 9 is used to carry out bandpass filtering to each beamlet, retains the frequency content of specific centre wavelength, filters
Except remaining frequency content.Wherein, incidence angle of the centre wavelength that any beamlet retains by the beamlet in filtering system 9 is determined
It is fixed.By the relative position for adjusting space divided beam system 8 and filtering system 9 and opposite deflection, realize that each beamlet is in filtering
There are different incidence angles on system 9；Since the incidence angle of each beamlet is different, pass through the middle cardiac wave retained after filtering system 9
Length is also different, by the different wave length ingredient of the research beamlet array, can reappear the information that incident beam includes,
Reflect variation of the target in ultrafast time range.By taking 16 framings as an example, incident beam beam splitting is such as by space divided beam system 8
Fig. 4 show 4 × 4 square beamlet arrays, and when space divided beam system 8 is parallel with filtering system 9, beamlet array enters
Firing angle has central symmetry relationship, and the incidence angle in order to ensure each beamlet is different, needs to revolve filtering system 9 around y-axis
Turn θ, and space divided beam system 8 around z-axis rotated into φ, it can be achieved that 16 sub-beams are on narrow band filter have it is different
Incidence angle.The structure and material of the narrow band filter 13 will be according to the centre wavelength, number of wavelengths, wavelength selectively filtered out
The decisions such as middle heart septum, halfwidth, transmissivity, free spectral range range.
Optionally, it is additionally provided with spatial position adjusting apparatus on space divided beam system 8 and/or filtering system 9, for adjusting
Relative tertiary location between filtering system 9 and space divided beam system 8 and angle, the center being filtered off so as to adjust each beamlet
Wavelength.
Imaging receiver system 10 is used to each beamlet of filtered system 9 being imaged on image capturing system 11 simultaneously
Different location on, realize single outburst imaging.
Image capturing system 11 is used to receive the picture of each beamlet, and is converted into picture signal output.Specifically, image is adopted
Collecting system 11 is embodied as CCD (Charge-coupled Device, imaging sensor), converts optical signal into electric signal and defeated
Go out, realizes the imaging of each beamlet.
Optionally, collimating optical system 7 and imaging receiver system 10 are set as zoom lens, meeting different operating condition
Under requirement to system focal length.
From the above it can be seen that a kind of restructural space frame imaging device provided by the invention is by using sky
Between divided beam system carry out space light splitting, effectively overcome using DOE elements carry out the of high cost, manufacture difficulty that light splitting is brought it is big,
Parameter such as fixes, is not easy adjustment at a series of defects, and the light splitting parameter of space divided beam system can be changed by way of programming, spirit
The framing quantity of adjustment system living, has restructural design feature, adapts to the work requirements under different condition, substantially increases
The scope of application of system.Due to being not necessarily to carry out element replacement, the light path for avoiding precision required after replacing element naturally adjusts,
The resetting difficulty for greatly reducing system improves system functional reliability.
Optionally, the beamlet array implement that space divided beam system 8 generates is rectangle beam splitting array, as shown in figure 5, with 16
For framing, in the case of rectangle score array, filtering system 9 or spatial modulator 12 rotate θ around y-axis, you can ensure 16
Beam beamlet incidence angle is all different.Compared to square beam splitting array, rectangle beam splitting array only needs once to rotate adjustment, greatly
System structure and debugging cost are simplified greatly, the operating accuracy of system can be effectively improved.
In some optional embodiments, space divided beam system 8 is embodied as spatial light modulator, the spatial light modulator
With programmable characteristic, the space tune to incident beam of the spatial light modulator can be adjusted by adjusting program parameters
It makes and uses, the adjusting to the intensity of the quantity of beamlet, each sub-light beam-emergence direction and each beamlet is realized, to make the present invention
The restructural space frame imaging device provided has restructural characteristic.
Further include point between the collimating optical system and the space divided beam system in some optional embodiments
Electro-optical device, as shown in fig. 6, more using light-dividing device realization for a kind of restructural space frame imaging device provided by the invention
The structural schematic diagram of road framing；In the embodiment, the light-dividing device is embodied as polarization beam splitting module, and incident light is divided into two bundles
Only include respectively the light beam of p-component comprising s components and only and passes through two spaces divided beam system and follow up device respectively so that point
Width quantity is doubled and redoubled.Light-dividing device provided by the invention should not be defined as polarization spectro, other optional spectroscopic modes are such as
Wavelength light splitting etc. should also be as being protected in interior.Correspondingly, the light splitting number of light-dividing device provided by the invention also should not only by
The number being limited in embodiment.
In some optional embodiments, filtering system 9 can be embodied as narrowband BPF or FP cavity configuration (Fabry-Perot
Cavity, Fabry-Bo Luo resonant cavity).It is with high costs since narrowband BPF manufacture crafts are extremely complex, it is preferable that filtering system
System 9 is embodied as FP cavity configurations, and the FP cavity configurations are provided with the long adjusting apparatus of chamber, the chamber length adjust be installed in addition with set can adjust it is described
The chamber of FP cavity configurations is long, to adjust the centre wavelength of the FP cavity configurations.By using FP cavity configurations as filtering system, greatly
The scheduling and planning cost of system is reduced greatly, and the centre wavelength of filtering system 9 flexibly and is accurately adjusted,
System is set to have restructural characteristic.
As shown in fig. 7, being a kind of framing knot of the embodiment of restructural space frame imaging device provided by the invention
Fruit schematic diagram.In the present embodiment, space divided beam system 8 is embodied as spatial light modulator, and filtering system 9 is embodied as FP chambers.Wherein,
Spatial light modulator is in 53.2 ° of optical axis rotation, i.e. Fig. 4Angle between FP chambers and spatial light modulator is
30 °, i.e. θ=30 ° in Fig. 4；The central horizontal distance of spatial light modulator and FP chambers is set as 16mm；Optionally, spatial light
The horizontal centre distance of modulator and FP chambers can be adjusted between 4mm-18.77mm.By the volume for changing spatial light modulator
Journey parameter so that incident chirped pulse light beam is divided into 4 × 4 rectangle beamlet array by spatial light modulator, by FP chambers
Filtering after, obtain result as shown in Figure 7 and be imaged on image capturing system, to obtain specific wavelength in incident beam
Part, and can be according to the anti-variation for releasing object under test in very short time of characteristic of chirped pulse.By adjusting θ with's
Size, you can the centre wavelength of each beamlet in adjustment Fig. 7, to realize to the different wave length component in incident chirped pulse
Selection；By change spatial light modulator program parameters, can realize the beamlet array of different number, such as 2 × 4,4 × 5,
3 × 6 etc..Above-mentioned adjustment process is not necessarily to carry out element replacement, it is only necessary to the relative position between regulating element or regulating element parameter
It is suitable for different experiment demands, greatly reduces use cost, improves the property easy to use of device.
Those of ordinary skills in the art should understand that：The discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under the thinking of the present invention, above example
Or can also be combined between the technical characteristic in different embodiments, and there are different aspects present invention as described above
Many other variations, in order to it is concise they do not provided in details.Therefore, all within the spirits and principles of the present invention,
Any omission, modification, equivalent replacement, improvement for being made etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of restructural space frame imaging device, it is characterised in that：Including：Collimating optical system, space divided beam system,
Filtering system, imaging receiver system and image capturing system；
Chirped pulse incident beam from object under test is after the collimating optical system, by the space divided beam system point
At in space be in two-dimensional array distribution multi beam beamlet, each beamlet by the filtering system filter after, respectively by
For the imaging receiver system imaging on the different location of described image acquisition system, the image-forming module receives each sub-light
The picture of beam is simultaneously converted to picture signal output.
2. a kind of restructural space frame imaging device as described in claim 1, it is characterised in that：It further include light splitting dress
It sets, the light-dividing device is placed between collimating optical system and space divided beam system.
3. a kind of restructural space frame imaging device as described in claim 1, it is characterised in that：The filtering system phase
Spatial position setting requirements for the space divided beam system are：So that each beamlet is when being incident on the filtering system,
The incidence angle of different beamlets is different.
4. a kind of restructural space frame imaging device as described in claim 1, it is characterised in that：On the filtering system
It is provided with spatial position adjusting apparatus.
5. a kind of restructural space frame imaging device as described in claim 1, it is characterised in that：Institute's space divided beam system
On be provided with spatial position adjusting apparatus.
6. a kind of restructural space frame imaging device as described in claim 1, it is characterised in that：The filtering system and
It is both provided with spatial position adjusting apparatus in the space divided beam system.
7. a kind of restructural space frame imaging device as described in claim 1 or 4, it is characterised in that：The filtering system
System is narrow-band filtering device or FP cavity configurations.
8. a kind of restructural space frame imaging device as claimed in claim 7, it is characterised in that：The FP cavity configurations are narrow
Band filter part further includes the long adjusting apparatus of chamber.
9. a kind of restructural space frame imaging device as described in claim 1, it is characterised in that：Space beam splitting system
The beamlet array that system generates is rectangle beam splitting array.
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| CN109444140A (en) * | 2018-12-14 | 2019-03-08 | 中国工程物理研究院激光聚变研究中心 | A kind of ultrafast full light single-shot multiframe imaging device |
| CN111781629A (en) * | 2020-07-09 | 2020-10-16 | 中国工程物理研究院激光聚变研究中心 | X-ray optical framing imaging system |
| CN112902866A (en) * | 2021-01-18 | 2021-06-04 | 武汉大学 | Spatial framing device, all-optical ultrafast imaging system and method |
| CN114051106A (en) * | 2021-10-29 | 2022-02-15 | 中国科学院西安光学精密机械研究所 | Spatial spectrum filtering frequency domain reconstruction high-speed imaging system and method |
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| CN112902866A (en) * | 2021-01-18 | 2021-06-04 | 武汉大学 | Spatial framing device, all-optical ultrafast imaging system and method |
| CN112902866B (en) * | 2021-01-18 | 2021-12-03 | 武汉大学 | Spatial framing device, all-optical ultrafast imaging system and method |
| CN114051106A (en) * | 2021-10-29 | 2022-02-15 | 中国科学院西安光学精密机械研究所 | Spatial spectrum filtering frequency domain reconstruction high-speed imaging system and method |
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