CN109141643B - Broadband signal light polarization component ratio measuring device and method - Google Patents
Broadband signal light polarization component ratio measuring device and method Download PDFInfo
- Publication number
- CN109141643B CN109141643B CN201811141904.0A CN201811141904A CN109141643B CN 109141643 B CN109141643 B CN 109141643B CN 201811141904 A CN201811141904 A CN 201811141904A CN 109141643 B CN109141643 B CN 109141643B
- Authority
- CN
- China
- Prior art keywords
- acousto
- optic
- light
- filtering
- broadband signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001914 filtration Methods 0.000 claims abstract description 116
- 238000001228 spectrum Methods 0.000 claims abstract description 72
- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 230000004888 barrier function Effects 0.000 claims description 16
- 239000000523 sample Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 206010058467 Lung neoplasm malignant Diseases 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002329 infrared spectrum Methods 0.000 claims description 3
- 201000005202 lung cancer Diseases 0.000 claims description 3
- 208000020816 lung neoplasm Diseases 0.000 claims description 3
- 238000010186 staining Methods 0.000 claims 1
- 239000000835 fiber Substances 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 238000000701 chemical imaging Methods 0.000 description 3
- 230000002547 anomalous effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- LAJZODKXOMJMPK-UHFFFAOYSA-N tellurium dioxide Chemical compound O=[Te]=O LAJZODKXOMJMPK-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J4/00—Measuring polarisation of light
- G01J4/04—Polarimeters using electric detection means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a broadband signal light polarization component ratio measuring device and method, comprising a control host, a white light source, a front-end optical device, a target object, a beam collimator, an acousto-optic filtering assembly and a spectrum detector which are sequentially connected, wherein the control host is respectively connected with the acousto-optic filtering assembly and the spectrum detector, the white light source continuously outputs light beams, broadband light from the white light source is converged and collimated by the front-end optical device to form parallel light beams, the parallel light beams vertically irradiate and transmit on the surface of the target object, the broadband signal light transmitted by the target object carries polarization information of the target object, the broadband signal light from the target object is converged and collimated by the beam collimator to form parallel light beams, the parallel light beams enter the acousto-optic filtering assembly for acousto-optic filtering, the spectrum detector receives the acousto-optic filtering light beams, acquires spectrum data and sends the spectrum data into the control host, and the control host calculates the polarization component ratio at any wavelength in the broadband signal light based on the spectrum data. The invention has good stability, and the method is simple and easy to operate.
Description
Technical Field
The invention relates to the technical field of optical filtering, in particular to a broadband signal light polarization component ratio measuring device and method.
Background
In the fields of hyperspectral imaging and the like, spectra and image information of a target object in different wavebands can be obtained simultaneously by utilizing an acousto-optic adjustable filter, and the method has great significance in analyzing the morphology and the composition of the target object. Therefore, the invention patent (acousto-optic tunable filter) discloses an acousto-optic tunable filter based on tellurium dioxide acousto-optic crystal, and the invention promotes the application of an acousto-optic filtering technology in the fields of optical filtering, hyperspectral imaging and the like. In optical imaging, besides spectral information, the optical polarization characteristics of the target object are also key attributes, and in different optical fields, the polarization state of light is one of important parameters. For example, in biomedical photonics, polarization imaging of light may provide information about pathological changes that is not provided by general imaging methods; in the field of remote sensing, a specified target object can be effectively identified by measuring light with a specific polarization state.
When the imaged signal light is broadband light in optical polarization imaging, if the polarization component ratio of the broadband light at any wavelength, that is, the intensity ratio of the horizontal polarization component and the vertical polarization component can be obtained, the hyperspectral polarization imaging result can be obtained, and the spectrum polarization component ratio of the target object can be obtained while the spectrum information of the target object is obtained. This is significant for identifying the polarization characteristics of the target object, but no related invention has been proposed so far.
In the acousto-optic filtering process, the broadband signal light is frequency f due to the acousto-optic action mechanism 0 In general, the diffracted light comprises two parts: the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam have mutually perpendicular polarization directions and have different center wavelengths. Wherein the +1-level acousto-optic filtering light beam is horizontally polarized, and the center wavelength is lambda +1 The 1-level acousto-optic filtering light beam is vertically polarized, and the central wavelength is lambda -1 . During anomalous acousto-optic interactions, the acousto-optic filtering process causes changes in polarization state. That is, the diffracted light has a wavelength lambda +1 And is horizontally polarized +1-level acousto-optic filtering light beam derived from broadband signal light with wavelength lambda +1 Is a vertical polarization of light; the wavelength of the filtered light beam is lambda -1 And vertically polarized-1 level acousto-optic filtering light beam from broadband signal light with wavelength lambda -1 Is a horizontal polarization of light. However, since the center wavelengths of the +1 st order acousto-optic filtered light beam and the-1 st order acousto-optic filtered light beam are different in the diffracted light, it is impossible to further calculate the polarization ratio of the broadband signal light at a certain wavelength by directly measuring the diffracted light intensity.
Based on the existing problems, if the device and the method for measuring the polarization component at any wavelength of the broadband signal light can be invented, the application of an acousto-optic filter is greatly promoted, and the device and the method play a larger role in the fields of hyperspectral imaging, spectral analysis and the like.
Disclosure of Invention
The invention aims to provide a broadband signal light polarization component ratio measuring device and a broadband signal light polarization component ratio measuring method.
The technical scheme adopted by the invention is as follows:
the broadband signal light polarization component ratio measuring device comprises a control host, a white light source, a front-end optical device, a target object, a beam collimator, an acousto-optic filter assembly and a spectrum detector which are sequentially connected, wherein the control host is respectively connected with the acousto-optic filter assembly and the spectrum detector, the white light source continuously outputs light beams in the visible light to near infrared spectrum range, broadband light from the white light source is converged and collimated by the front-end optical device to form parallel light beams, the parallel light beams vertically irradiate to the surface of the target object and transmit, broadband signal light transmitted by the target object carries polarization information of the target object, the broadband signal light from the target object is converged and collimated into the parallel light beams by the beam collimator to enter the acousto-optic filter assembly for acousto-optic filtering, the spectrum detector receives the acousto-optic filter light beams and obtains spectrum data to be sent into the control host, and the control host calculates the polarization component ratio at any wavelength of the broadband signal light from the target object based on the spectrum data.
Further, the white light source is a white light LED.
Further, the front-end optical device is an optical telescope system.
Further, the target object is a non-stained section of human lung cancer tissue.
Further, the beam collimator is composed of an achromatic double-cemented convex lens group and a double-cemented concave lens.
Further, the acousto-optic filter assembly comprises an acousto-optic filter, an angle precise adjustment turntable, a radio frequency source and a light barrier, wherein the angle precise adjustment turntable is driven by an electric motor, the angle precise adjustment turntable is connected with a control host through a USB connecting wire, the acousto-optic filter is fixed on the upper surface of the angle precise adjustment turntable, and the angle of the acousto-optic filter relative to a parallel light beam from a light beam collimator is precisely controlled through adjusting the rotation angle of the angle precise adjustment turntable;
the acousto-optic filter is connected with the radio frequency source through a radio frequency line, the wavelength of the +1-level acousto-optic filtering light beam and the wavelength of the-1-level acousto-optic filtering light beam which are output by the acousto-optic filter are continuously adjusted by changing the frequency of the radio frequency signal output by the radio frequency source, the light barrier is positioned at the rear end of the acousto-optic filter, the light barrier is a black aluminum alloy disc with the surface being anodized, the light barrier receives the zero-level non-filtering light beam output by the acousto-optic filter, and the zero-level non-filtering light beam is prevented from affecting the detection of the +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam which are horizontally polarized by the spectrum detector.
Further, the minimum resolution of the angle precise adjustment turntable is 5 minutes, the lower surface of the angle precise adjustment turntable is connected with a bracket, and the bracket fixes the angle precise adjustment turntable.
Further, the spectrum detector is a fiber bragg grating spectrometer, and comprises a fiber optic probe, a beam splitting grating and a high-sensitivity CCD array, wherein the fiber optic probe is used for receiving the +1-level acousto-optic filtering light beam and the-1-level acousto-optic filtering light beam from the acousto-optic filtering component and sending the light beams into the beam splitting grating for beam splitting; the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam are received by a CCD array after being split, the CCD array measures the intensities of signal lights with different wavelengths in the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam, and data are sent to a subsequent control host.
Further, the spectral resolution of the spectral probe in the visible to near infrared range is 0.2nm.
Further, the control host consists of a PC, and the PC is respectively connected with the radio frequency source, the angle precise adjustment turntable and the spectrum detector through USB connecting wires, and the control host respectively carries out parameter adjustment and control on the radio frequency source, the angle precise adjustment turntable and the spectrum detector; and the PC receives the spectrum data from the spectrum detector, and analysis and storage of the spectrum data are completed.
The invention further discloses a broadband signal light polarization component ratio measuring method, which comprises the following steps:
step 201: starting the system, namely initializing a white light source, an acousto-optic filter assembly, a spectrum detector and a control host;
step 202: setting parameters of a front-end optical device according to the position of a white light source and luminous intensity parameters, ensuring that light beams from the white light source are converged and collimated, and transmitting the collimated light beams to a target object;
step 203: adjusting the spatial position of the target object so that the collimated light beam from the front end optics irradiates the target object perpendicular to the surface of the target object;
step 204: adjusting parameters and positions of a beam collimator, collecting and collimating broadband signal light transmitted by a target object, and sending the collimated beam into an acousto-optic filtering assembly for acousto-optic filtering;
step 205: the space position and the angle of the rotating table are precisely adjusted by adjusting the space position and the angle of an acousto-optic filter in the acousto-optic filter assembly, and the incident light polar angle theta is determined 0 Ensuring accurate reception of the collimated light beam from the beam collimator; determining the frequency f of the RF signal output by the RF source 0 The collimated light beam from the light beam collimator is subjected to acousto-optic filtering, the position of the light barrier is adjusted to completely receive the zero-order non-filtered light beam output by the acousto-optic filter, the zero-order non-filtered light beam is prevented from entering the spectrum detector, and only the +1-order acousto-optic filtered light beam with horizontal polarization and the-1-order acousto-optic light beam with vertical polarization are reservedFiltering the light beam; calculating the incident light polar angle theta by utilizing the acousto-optic action relation 0 The frequency of the radio frequency signal is f 0 When the wavelength lambda with the same diffraction efficiency is in the horizontally polarized +1-order acousto-optic filtering light beam and the vertically polarized-1-order acousto-optic filtering light beam 0 ；
Step 206: the position of an optical fiber probe in the spectrum detector is regulated, the horizontally polarized +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam which are output by the acousto-optic filter are respectively and accurately received, the gain and exposure time parameters of a CCD in the spectrum detector are regulated, and the spectrum information of the horizontally polarized +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam is accurately measured;
step 207: the control host is utilized to analyze and process the spectrum data obtained by the spectrum detector, and the output of the horizontal polarized +1 level acousto-optic filtering light beam and the vertical polarized-1 level acousto-optic filtering light beam by the acousto-optic filter is calculated at the wavelength lambda 0 The intensity ratio at the position can obtain the broadband signal light at the wavelength lambda 0 Polarization component ratio at the position; changing the frequency of a radio frequency signal output by a radio frequency source in the acousto-optic filtering assembly, and repeating the steps 205-207 to obtain the polarization component ratio of broadband signal light at any wavelength;
step 208: and storing the obtained broadband signal light polarization component ratio measurement result, and closing the system.
The invention solves the problem of accurate measurement of the polarization component ratio of the broadband signal light by adopting the technical scheme, can accurately measure the polarization component ratio at any wavelength in the broadband signal light, and has the advantages of high measurement precision, good system stability and simple and easy operation.
Drawings
The invention is described in further detail below with reference to the drawings and detailed description;
FIG. 1 is a schematic diagram of a device for measuring polarization component ratio of broadband signal light according to the present invention;
FIG. 2 is a flow chart of a method for measuring polarization component ratio of broadband signal light according to the present invention.
Detailed Description
The invention discloses a broadband signal light polarization component ratio measuring device, which comprises a control host, a white light source, a front-end optical device, a target object, a beam collimator, an acousto-optic filtering assembly and a spectrum detector which are sequentially connected, wherein the control host is respectively connected with the acousto-optic filtering assembly and the spectrum detector, the white light source continuously outputs light beams in the visible light to near infrared spectrum range, broadband light from the white light source is converged and collimated by the front-end optical device to form parallel light beams, the parallel light beams vertically irradiate on the surface of the target object and are transmitted, the broadband signal light transmitted by the target object carries polarization information of the target object, the broadband signal light from the target object is converged and collimated by the beam collimator to form parallel light beams, the parallel light beams enter the acousto-optic filtering assembly for acousto-optic filtering, the spectrum detector receives the acousto-optic filtering light beams, acquires spectrum data and sends the spectrum data into the control host, and the control host calculates the polarization component ratio at any wavelength in the broadband signal light from the target object based on the spectrum data.
Further, the white light source is a white light LED.
Further, the front-end optical device is an optical telescope system.
Further, the target object is a non-stained section of human lung cancer tissue.
Further, the beam collimator is composed of an achromatic double-cemented convex lens group and a double-cemented concave lens.
Further, the acousto-optic filter assembly comprises an acousto-optic filter, an angle precise adjustment turntable, a radio frequency source and a light barrier, wherein the angle precise adjustment turntable is driven by an electric motor, the angle precise adjustment turntable is connected with a control host through a USB connecting wire, the acousto-optic filter is fixed on the upper surface of the angle precise adjustment turntable, and the angle of the acousto-optic filter relative to a parallel light beam from a light beam collimator is precisely controlled through adjusting the rotation angle of the angle precise adjustment turntable;
the acousto-optic filter is connected with the radio frequency source through a radio frequency line, the wavelength of the +1-level acousto-optic filtering light beam and the wavelength of the-1-level acousto-optic filtering light beam which are output by the acousto-optic filter are continuously adjusted by changing the frequency of the radio frequency signal output by the radio frequency source, the light barrier is positioned at the rear end of the acousto-optic filter, the light barrier is a black aluminum alloy disc with the surface being anodized, the light barrier receives the zero-level non-filtering light beam output by the acousto-optic filter, and the zero-level non-filtering light beam is prevented from affecting the detection of the +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam which are horizontally polarized by the spectrum detector.
Further, the minimum resolution of the angle precise adjustment turntable is 5 minutes, the lower surface of the angle precise adjustment turntable is connected with a bracket, and the bracket fixes the angle precise adjustment turntable.
Further, the spectrum detector is a fiber bragg grating spectrometer, and comprises a fiber optic probe, a beam splitting grating and a high-sensitivity CCD array, wherein the fiber optic probe is used for receiving the +1-level acousto-optic filtering light beam and the-1-level acousto-optic filtering light beam from the acousto-optic filtering component and sending the light beams into the beam splitting grating for beam splitting; the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam are received by a CCD array after being split, the CCD array measures the intensities of signal lights with different wavelengths in the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam, and data are sent to a subsequent control host.
Further, the spectral resolution of the spectral probe in the visible to near infrared range is 0.2nm.
Further, the control host consists of a PC, and the PC is respectively connected with the radio frequency source, the angle precise adjustment turntable and the spectrum detector through USB connecting wires, and the control host respectively carries out parameter adjustment and control on the radio frequency source, the angle precise adjustment turntable and the spectrum detector; and the PC receives the spectrum data from the spectrum detector, and analysis and storage of the spectrum data are completed.
The invention further discloses a broadband signal light polarization component ratio measuring method, which comprises the following steps:
step 201: starting the system, namely initializing a white light source, an acousto-optic filter assembly, a spectrum detector and a control host;
step 202: setting parameters of a front-end optical device according to the position of a white light source and luminous intensity parameters, ensuring that light beams from the white light source are converged and collimated, and transmitting the collimated light beams to a target object;
step 203: adjusting the spatial position of the target object so that the collimated light beam from the front end optics irradiates the target object perpendicular to the surface of the target object;
step 204: adjusting parameters and positions of a beam collimator, collecting and collimating broadband signal light transmitted by a target object, and sending the collimated beam into an acousto-optic filtering assembly for acousto-optic filtering;
step 205: the space position and the angle of the rotating table are precisely adjusted by adjusting the space position and the angle of an acousto-optic filter in the acousto-optic filter assembly, and the incident light polar angle theta is determined 0 Ensuring accurate reception of the collimated light beam from the beam collimator; determining the frequency f of the RF signal output by the RF source 0 The method comprises the steps of performing acousto-optic filtering on a collimated light beam from a light beam collimator, adjusting the position of a light barrier to completely receive a zero-order non-filtered light beam output by the acousto-optic filter, preventing the zero-order non-filtered light beam from entering a spectrum detector, and only retaining a +1-order acousto-optic filtered light beam with horizontal polarization and a-1-order acousto-optic filtered light beam with vertical polarization; calculating the incident light polar angle theta by utilizing the acousto-optic action relation 0 The frequency of the radio frequency signal is f 0 When the wavelength lambda with the same diffraction efficiency is in the horizontally polarized +1-order acousto-optic filtering light beam and the vertically polarized-1-order acousto-optic filtering light beam 0 ；
Step 206: the position of an optical fiber probe in the spectrum detector is regulated, the horizontally polarized +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam which are output by the acousto-optic filter are respectively and accurately received, the gain and exposure time parameters of a CCD in the spectrum detector are regulated, and the spectrum information of the horizontally polarized +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam is accurately measured;
step 207: the control host is utilized to analyze and process the spectrum data obtained by the spectrum detector, and the output of the horizontal polarized +1 level acousto-optic filtering light beam and the vertical polarized-1 level acousto-optic filtering light beam by the acousto-optic filter is calculated at the wavelength lambda 0 The intensity ratio at the position can obtain the wavelength of the broadband signal lightλ 0 Polarization component ratio at the position; changing the frequency of a radio frequency signal output by a radio frequency source in the acousto-optic filtering assembly, and repeating the steps 205-207 to obtain the polarization component ratio of broadband signal light at any wavelength;
step 208: and storing the obtained broadband signal light polarization component ratio measurement result, and closing the system.
The specific broadband signal light polarization component ratio measuring method is realized based on the hardware equipment and the control software in the following modes: the broadband light emitted by the white light source is converged and collimated by the front-end optical device, then vertically irradiates the surface of the target object, and the broadband signal light transmitted by the target object is received by the beam collimator and is condensed and collimated; the collimated light beam output by the light beam collimator enters the acousto-optic filter assembly, and becomes three beams which are spatially separated after being subjected to acousto-optic filtering by the acousto-optic filter, and the method comprises the following steps: the zero-order non-filtering light beam, the horizontally polarized +1-order acousto-optic filtering light beam and the vertically polarized-1-order acousto-optic filtering light beam are blocked by utilizing the light barrier, and the horizontally polarized +1-order acousto-optic filtering light beam and the vertically polarized-1-order acousto-optic filtering light beam are reserved; the angle precision adjusting turntable can precisely control the angle of the acousto-optic filter relative to the collimated light beam from the light beam collimator, namely the incident photon angle; calculating the incident light polar angle theta by utilizing the acousto-optic action relationship 0 Ultrasonic frequency f 0 When the wavelength lambda with the same diffraction efficiency is in the horizontally polarized +1-order acousto-optic filtering light beam and the vertically polarized-1-order acousto-optic filtering light beam 0 The method comprises the steps of carrying out a first treatment on the surface of the The +1 level acousto-optic filtering light beam with horizontal polarization and the-1 level acousto-optic filtering light beam with vertical polarization are respectively received by a spectrum detector, and spectrum information of the +1 level acousto-optic filtering light beam with horizontal polarization and the-1 level acousto-optic filtering light beam with vertical polarization is respectively measured; the control host receives and analyzes the spectrum information from the spectrum detector, and calculates the wavelength lambda in the horizontal polarized +1 level acousto-optic filtering light beam and the vertical polarized-1 level acousto-optic filtering light beam respectively 0 The intensity of the light is further determined to obtain the wavelength lambda in the broadband signal light 0 Polarization component ratio at the position; the frequency of the radio frequency signal output by the radio frequency source is changed, and the steps are repeated, so that the accurate measurement of the polarization component ratio at any wavelength in the broadband signal light can be realized; finally, for the measured widthAnd storing the polarized component ratio result of the signal light to finish the measurement process of the polarized component ratio of the broadband signal light.
The invention solves the problem of accurate measurement of the polarization component ratio of the broadband signal light by adopting the technical scheme, can accurately measure the polarization component ratio at any wavelength in the broadband signal light, and has the advantages of high measurement precision, good system stability and simple and easy operation.
Claims (7)
1. A method for measuring the polarization component ratio of broadband signal light is characterized by comprising the following steps: the adopted broadband signal light polarization component ratio measuring device comprises a control host, a white light source, a front-end optical device, a target object, a beam collimator, an acousto-optic filter assembly and a spectrum detector which are sequentially connected, wherein the control host is respectively connected with the acousto-optic filter assembly and the spectrum detector, the white light source continuously outputs light beams in the visible light to near infrared spectrum range, broadband light of the white light source is converged and collimated by the front-end optical device to form parallel light beams, the parallel light beams vertically irradiate on the surface of the target object and transmit, the broadband signal light transmitted by the target object carries polarization information of the target object, the broadband signal light from the target object is converged and collimated by the beam collimator to form parallel light beams, the parallel light beams enter the acousto-optic filter assembly for acousto-optic filtering, the spectrum detector receives the acousto-optic filter light beams, acquires spectrum data and sends the spectrum data into the control host, and the control host calculates the polarization component ratio at any wavelength in the broadband signal light from the target object based on the spectrum data;
the acousto-optic filter assembly comprises an acousto-optic filter, an angle precise adjustment turntable, a radio frequency source and a light barrier, wherein the angle precise adjustment turntable is driven by an electric motor, the angle precise adjustment turntable is connected with a control host through a USB connecting wire, the acousto-optic filter is fixed on the upper surface of the angle precise adjustment turntable, and the angle of the acousto-optic filter relative to a parallel beam from a beam collimator is precisely controlled through the rotation angle of the angle precise adjustment turntable;
the acousto-optic filter is connected with the radio frequency source through a radio frequency line, the wavelength of a +1-level acousto-optic filtering beam and a-1-level acousto-optic filtering beam which are output by the acousto-optic filter is continuously adjusted by changing the frequency of a radio frequency signal output by the radio frequency source, the light barrier is positioned at the rear end of the acousto-optic filter, the light barrier is a black aluminum alloy disc with the surface being anodized, the light barrier receives a zero-level non-filtering beam output by the acousto-optic filter, and the zero-level non-filtering beam is prevented from affecting the detection of the +1-level acousto-optic filtering beam and the vertically polarized-1-level acousto-optic filtering beam which are horizontally polarized by the spectrum detector;
the optical spectrum detector is an optical fiber grating spectrometer and comprises an optical fiber probe, a beam splitting grating and a high-sensitivity CCD array, wherein the optical fiber probe is used for receiving a +1 level acousto-optic filtering light beam and a-1 level acousto-optic filtering light beam from the acousto-optic filtering component and sending the light beam into the beam splitting grating for beam splitting; the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam are received by a CCD array after being split, the CCD array measures the intensities of signal lights with different wavelengths in the +1 level acousto-optic filtering light beam and the-1 level acousto-optic filtering light beam, and data are sent to a subsequent control host; the method comprises the following steps:
step 201: starting the system, namely initializing a white light source, an acousto-optic filter assembly, a spectrum detector and a control host;
step 202: setting parameters of a front-end optical device according to the position and luminous intensity parameters of a white light source, converging and collimating light beams from the white light source, and transmitting the collimated light beams to a target object;
step 203: adjusting the spatial position of the target object so that the collimated light beam from the front end optics irradiates the target object perpendicular to the surface of the target object;
step 204: adjusting parameters and positions of a beam collimator, collecting and collimating broadband signal light transmitted by a target object, and sending the collimated beam into an acousto-optic filtering assembly for acousto-optic filtering;
step 205: the space position and the angle of the rotating table are precisely adjusted by adjusting the space position and the angle of an acousto-optic filter in the acousto-optic filter assembly, and the incident light polar angle theta is determined 0 Ensuring accurate reception of the collimated light beam from the beam collimator; determining the frequency f of the RF signal output by the RF source 0 Collimation from beam collimatorsThe beam is subjected to acousto-optic filtering, the position of a light barrier is adjusted to completely receive the zero-order non-filtering beam output by the acousto-optic filter, the zero-order non-filtering beam is prevented from entering a spectrum detector, and only the +1-order acousto-optic filtering beam with horizontal polarization and the-1-order acousto-optic filtering beam with vertical polarization are reserved; calculating the incident light polar angle theta by utilizing the acousto-optic action relation 0 The frequency of the radio frequency signal is f 0 When the wavelength lambda with the same diffraction efficiency is in the horizontally polarized +1-order acousto-optic filtering light beam and the vertically polarized-1-order acousto-optic filtering light beam 0；
Step 206: the position of an optical fiber probe in the spectrum detector is regulated, the horizontally polarized +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam which are output by the acousto-optic filter are respectively and accurately received, the gain and exposure time parameters of a CCD in the spectrum detector are regulated, and the spectrum information of the horizontally polarized +1-level acousto-optic filtering light beam and the vertically polarized-1-level acousto-optic filtering light beam is accurately measured;
step 207: the control host is utilized to analyze and process the spectrum data obtained by the spectrum detector, and the output of the horizontal polarized +1 level acousto-optic filtering light beam and the vertical polarized-1 level acousto-optic filtering light beam by the acousto-optic filter is calculated at the wavelength lambda 0 The intensity ratio at the position can obtain the broadband signal light at the wavelength lambda 0 Polarization component ratio at the position; changing the frequency of a radio frequency signal output by a radio frequency source in the acousto-optic filtering assembly, and repeating the steps 205-207 to obtain the polarization component ratio of broadband signal light at any wavelength;
step 208: and storing the obtained broadband signal light polarization component ratio measurement result, and closing the system.
2. The method for measuring the polarization component ratio of broadband signal light according to claim 1, wherein the method comprises the steps of: the white light source is a white light LED.
3. The method for measuring the polarization component ratio of broadband signal light according to claim 1, wherein the method comprises the steps of: the front-end optical device is an optical telescope system.
4. The method for measuring the polarization component ratio of broadband signal light according to claim 1, wherein the method comprises the steps of: the target object is a non-staining slice of human lung cancer tissue.
5. The method for measuring the polarization component ratio of broadband signal light according to claim 1, wherein the method comprises the steps of: the beam collimator consists of an achromatic double-cemented convex lens group and a double-cemented concave lens.
6. The method for measuring the polarization component ratio of broadband signal light according to claim 1, wherein the method comprises the steps of: the minimum resolution of the angle precise adjustment turntable is 5 minutes, the lower surface of the angle precise adjustment turntable is connected with a bracket, and the bracket fixes the angle precise adjustment turntable.
7. The method for measuring the polarization component ratio of broadband signal light according to claim 1, wherein the method comprises the steps of: the control host consists of a PC, and the PC is respectively connected with the radio frequency source, the angle precise adjustment turntable and the spectrum detector through USB connecting wires, and the control host respectively carries out parameter adjustment and control on the radio frequency source, the angle precise adjustment turntable and the spectrum detector; and the PC receives the spectrum data from the spectrum detector, and analysis and storage of the spectrum data are completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141904.0A CN109141643B (en) | 2018-09-28 | 2018-09-28 | Broadband signal light polarization component ratio measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811141904.0A CN109141643B (en) | 2018-09-28 | 2018-09-28 | Broadband signal light polarization component ratio measuring device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109141643A CN109141643A (en) | 2019-01-04 |
| CN109141643B true CN109141643B (en) | 2024-01-30 |
Family
ID=64813460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811141904.0A Active CN109141643B (en) | 2018-09-28 | 2018-09-28 | Broadband signal light polarization component ratio measuring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109141643B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417618A (en) * | 2002-10-14 | 2003-05-14 | 天津市先石光学技术有限公司 | Method of raising S/N ratio of AOTF spectroscopic optical system |
| CN1485605A (en) * | 2002-09-29 | 2004-03-31 | �Ϻ���ͨ��ѧ | Optical method for detecting discerptible medium skin layer and deep layer information |
| US7428048B1 (en) * | 2004-12-30 | 2008-09-23 | Spectral Molecular Imaging Inc. | Imaging elastic scattering spectroscopy |
| CN102023056A (en) * | 2009-09-16 | 2011-04-20 | 中国科学院西安光学精密机械研究所 | Programmable polarization hyperspectral imager based on field splicing |
| CN102226718A (en) * | 2011-03-31 | 2011-10-26 | 长春理工大学 | Sound light polarization spectrum camera |
| CN203881515U (en) * | 2014-03-28 | 2014-10-15 | 中国科学院上海技术物理研究所 | Self-reference acousto-optic tunable light filter diffraction performance testing device |
| CN105157837A (en) * | 2015-05-28 | 2015-12-16 | 中北大学 | Hyperspectral full polarization imager based on acousto-optic filtering and electro-optical phase modulation |
| CN107272226A (en) * | 2017-07-19 | 2017-10-20 | 福建师范大学 | A kind of acousto-optic based on angle tuning is adjustable filter |
| CN208704885U (en) * | 2018-09-28 | 2019-04-05 | 福建师范大学 | A kind of broadband signal light polarization composition compares measuring device |
-
2018
- 2018-09-28 CN CN201811141904.0A patent/CN109141643B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1485605A (en) * | 2002-09-29 | 2004-03-31 | �Ϻ���ͨ��ѧ | Optical method for detecting discerptible medium skin layer and deep layer information |
| CN1417618A (en) * | 2002-10-14 | 2003-05-14 | 天津市先石光学技术有限公司 | Method of raising S/N ratio of AOTF spectroscopic optical system |
| US7428048B1 (en) * | 2004-12-30 | 2008-09-23 | Spectral Molecular Imaging Inc. | Imaging elastic scattering spectroscopy |
| CN102023056A (en) * | 2009-09-16 | 2011-04-20 | 中国科学院西安光学精密机械研究所 | Programmable polarization hyperspectral imager based on field splicing |
| CN102226718A (en) * | 2011-03-31 | 2011-10-26 | 长春理工大学 | Sound light polarization spectrum camera |
| CN203881515U (en) * | 2014-03-28 | 2014-10-15 | 中国科学院上海技术物理研究所 | Self-reference acousto-optic tunable light filter diffraction performance testing device |
| CN105157837A (en) * | 2015-05-28 | 2015-12-16 | 中北大学 | Hyperspectral full polarization imager based on acousto-optic filtering and electro-optical phase modulation |
| CN107272226A (en) * | 2017-07-19 | 2017-10-20 | 福建师范大学 | A kind of acousto-optic based on angle tuning is adjustable filter |
| CN208704885U (en) * | 2018-09-28 | 2019-04-05 | 福建师范大学 | A kind of broadband signal light polarization composition compares measuring device |
Non-Patent Citations (3)
| Title |
|---|
| 基于双AOTF的新型成像光谱偏振探测系统;张瑞;陈友华;李世伟;王志斌;温廷敦;王耀利;李克武;;光谱学与光谱分析(第05期);全文 * |
| 基于声光效应的相干光探测方法的研究;蒋红艳;何宁;;光电子技术(第03期);全文 * |
| 声光可调谐滤波器成像光谱仪光学系统设计;常凌颖;赵葆常;邱跃洪;汶德胜;马小龙;;光学学报(第10期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109141643A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10393657B2 (en) | SPR detection system and method | |
| CN104483104B (en) | A kind of photo detector spectral response analysis system | |
| US20060243911A1 (en) | Measuring Technique | |
| CN105928688B (en) | The measuring device and method of diffraction efficiency of grating spectrum based on single exposure pattern | |
| RU188541U1 (en) | MULTIWAVE LIDAR FOR SENSING ATMOSPHERE | |
| CN106442467A (en) | Spatial autofocusing laser confocal imaging Raman-spectrum detecting method and device | |
| CN108169207A (en) | Space autofocusing laser differential confocal Raman spectrum imaging detection method and device | |
| CN107345908B (en) | Scattering system for acquiring multi-surface diffuse reflection information of fruits | |
| CN106546334A (en) | Space autofocusing confocal laser Raman spectroscopic detection method and apparatus | |
| CN109613560A (en) | EO-1 hyperion three-dimensional laser radar system based near infrared light Full wave shape ranging | |
| CN107272226A (en) | A kind of acousto-optic based on angle tuning is adjustable filter | |
| CN104568899A (en) | Portable raman spectrometer | |
| KR100886205B1 (en) | Hyperspectral polarization imaging apparatus for in vivo optical diagnostics | |
| KR20230043066A (en) | Device for analyzing composition based on spectroscopy and method for analyzing composition of object using the same | |
| CN102778202A (en) | Device and method used for measuring film thickness | |
| CN108226131A (en) | A kind of space panorama laser differential confocal Raman spectrum imaging detection method and device | |
| CN109141643B (en) | Broadband signal light polarization component ratio measuring device and method | |
| US10107745B2 (en) | Method and device for estimating optical properties of a sample | |
| US20140071260A1 (en) | Digital confocal optical profile microscopy | |
| CN208704885U (en) | A kind of broadband signal light polarization composition compares measuring device | |
| KR101101196B1 (en) | Spectrometer of multi-channel connecting a plural of optical | |
| CN106770154A (en) | Space autofocusing laser differential confocal Raman spectroscopic detection method and apparatus | |
| CN208704882U (en) | A kind of dispersion compensation device of Acousto-optic filtering diffraction light | |
| KR101337087B1 (en) | Doppler lidar apparatus and method for operating doppler lidar apparatus | |
| US20150355023A1 (en) | System and Method of Alignment for Balanced Detection in a Spectral Domain Optical Coherence Tomography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |