CN110763339B - Double-filtering energy feedback type hyperspectral imaging polarization detection device - Google Patents
Double-filtering energy feedback type hyperspectral imaging polarization detection device Download PDFInfo
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- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0224—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using polarising or depolarising elements
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- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
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- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/1256—Generating the spectrum; Monochromators using acousto-optic tunable filter
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- 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
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/447—Polarisation spectrometry
Abstract
The invention belongs to the technical field of hyperspectral imaging polarization detection, and particularly relates to a dual-filter energy feedback type hyperspectral imaging polarization detection device, which aims to perform hyperspectral polarization imaging on a target to be detected, so that the target to be detected has high spectral resolution and polarization detection capability. The hyperspectral imaging polarization detection device comprises a polarization control unit consisting of a first liquid crystal phase variable retarder and a second liquid crystal phase variable retarder, and a hyperspectral control unit consisting of a first acousto-optic tunable filter and a second acousto-optic tunable filter; after the incident light is modulated into linearly polarized light by the polarizing prism, the linearly polarized light is subjected to phase delay through the two liquid crystal phase variable retarders, secondary filtering is performed through the two acousto-optic tunable filters, and finally the narrow-band diffracted light is received by the imaging detector.
Description
Technical Field
The invention belongs to the technical field of hyperspectral imaging polarization detection, and particularly relates to a dual-filter energy feedback type hyperspectral imaging polarization detection device.
Background
The imaging polarization spectrum technology is a very important means for acquiring information, not only can well distinguish low-reflection areas and contours on a target, but also can identify three-dimensional information of the target to be detected in a complex background environment, and has very high application value in industry and agriculture.
The polarization detection is further expanded on the basis of traditional detected light intensity, spectrum and space three-dimensional data, and four dimensions of polarization degree, polarization azimuth angle, polarization ellipticity and rotation direction are increased. The polarization spectral characteristics of an object are determined by the properties of the object, and compared with an artificial object, the surface of a natural target is overall rough and has no obvious contour rule, so that the radiation light or the reflected light of the natural target presents a diffuse reflection phenomenon, and the linear polarization degree is very small and is almost zero, such as objects in forests, deserts and the like. Imaging polarization detection techniques exploit this physical difference between artificial and natural targets to distinguish them from natural targets. The change rule of the polarization characteristic of the measured target along with the wavelength is obtained in the remote sensing process, so that the surface physicochemical characteristic of the target can be obtained, and the dependency relationship is generally called as the polarization spectrum characteristic of the target. The polarization characteristic of the target determines that the polarization imaging detection has unique advantages compared with the intensity imaging: (1) based on the characteristic that the polarization difference between the artificial target and the natural background is obvious, the polarization imaging has unique advantages in the aspect of highlighting the artificial target from the complex background; (2) based on the property that polarization is independent of the optical information dimension of intensity and spectrum, polarization imaging has a solution that offers a possibility in terms of hidden, disguised, stealth, dim target discovery; (3) based on the characteristic that polarization information has stronger retention capacity than intensity scattering in a scattering medium, polarization imaging has the advantage of increasing the action distance in haze and smoke dust.
The hyperspectral imaging technology can acquire high-resolution imaging while acquiring a narrow-bandwidth spectrum continuous curve of a target in a detected scene, can provide more visual and abundant detected target information in practical application, can provide abundant space structure information and numerous spectral information of an identified target, and can provide surface two-dimensional data of the identified target and third-dimensional spectral data of pixels corresponding to any region in a detected space. The more spectral bands in the unit wavelength range, that is, the smaller the minimum wavelength interval that can be resolved, the narrower the spectral bandwidth, the higher the corresponding spectral resolution, and the more continuous and smoother the obtained spectral curve, the closer the characteristic of the identified target is to the real.
The hyperspectral imaging polarization detection system perfectly combines the hyperspectral imaging technology and the polarization detection technology. The hyperspectral polarization imaging detection can provide the characteristics of surface roughness, texture trend, surface conductivity, material physical and chemical properties, water content and the like which cannot be displayed by a light intensity image of a target, and has obvious superiority to the identification of object outlines and surface orientations. The spectral imaging technology not only has image resolution capability, but also has spectral resolution capability, and has profound significance in target detection by identifying and classifying targets by using spectral differences of surface components of objects.
The most common polarization imaging detection device is a polarizer based on mechanical rotation, the polarization imaging system of the type has a large field angle, the polarization state of incident light is modulated by a polarization device of the polarization imaging detection device through a mechanical rotation device, the requirement on the synchronism of a camera and the rotation device is high, only linear polarization can be detected, the modulation precision and the frame frequency speed of the polarization state of the incident light are low, the reliability of the system is not high, and the volume is large. Subsequently, some researchers at home and abroad perform related imaging spectrum polarization detection experimental research based on a Liquid Crystal Tunable Filter (LCTF), detect the polarization state of incident light by rotating the LCTF, but have a long response time and no phase delay device, and cannot detect the circular polarization component of a target, so that the application of the liquid crystal tunable filter is greatly limited. According to the analysis, the optical filter needs to be rotated for the optical filter type polarization detection equipment, and the number of the provided spectral channels is quite limited; the polaroid type detection equipment needs a mechanical rotating polaroid and can only obtain the first three components of Stokes parameters; the novel polarization detection device based on LCTF can simultaneously obtain a polarization spectrum with higher resolution, but has higher requirement on the synchronism among instruments.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides another polarization imaging detection device, namely: the utility model provides a pair of filter energy feedback type hyperspectral imaging polarization detection device, the device can carry out the hyperspectral polarization imaging to the target of being surveyed, can implement spectral imaging fast and survey to can acquire the full polarization information of scene simultaneously, both possess high spectral resolution, also have polarization detectivity, more importantly utilizes energy feedback technique, can make the narrowband diffraction light intensity of final output highest.
In order to achieve the above purpose, the specific technical solution of the present invention is:
a dual-filter energy feedback type hyperspectral imaging polarization detection device is characterized in that: the device comprises a polarizing prism arranged on an incident light path, incident light is modulated into linearly polarized light through the polarizing prism, the linearly polarized light sequentially passes through a first liquid crystal phase variable retarder and a second liquid crystal phase variable retarder and then enters a first 2 x 1 optical fiber coupler, light emitted from the first 2 x 1 optical fiber coupler enters a first acousto-optic tunable filter, the first acousto-optic tunable filter is connected with a first radio frequency driver, the first radio frequency driver is connected with a computer, the computer controls the first radio frequency driver to generate high-frequency ultrasonic waves to generate acousto-optic interaction with the incident light, 0-level transmission light emitted from the first acousto-optic tunable filter is transmitted into the second 2 x 1 optical fiber coupler through an optical fiber, and diffracted light emitted from the first acousto-optic tunable filter enters a second acousto-optic tunable filter;
the second acousto-optic tunable filter is connected with a second radio frequency driver, the second radio frequency driver is connected with a computer, the computer controls the second radio frequency driver to generate high-frequency ultrasonic waves to perform acousto-optic interaction with diffracted light emitted by the first acousto-optic tunable filter, 0-level transmitted light emitted by the second acousto-optic tunable filter is transmitted to a third liquid crystal phase variable retarder connected with the computer through an optical fiber to be modulated and then enters a second 2 x 1 optical fiber coupler, the diffracted light emitted by the second acousto-optic tunable filter passes through a high-speed image acquisition card to be received by a detector, and the detector transmits the obtained spectral image to the computer connected with the detector; two beams of 0-level transmission light are transmitted to the first 2X 1 optical fiber coupler by the optical fiber after being combined by the second 2X 1 optical fiber coupler to generate acousto-optic interaction again;
the first liquid crystal phase variable retarder is connected with a first liquid crystal phase variable retarder voltage drive, the second liquid crystal phase variable retarder is connected with a second liquid crystal phase variable retarder voltage drive, the third liquid crystal phase variable retarder is connected with a third liquid crystal phase variable retarder voltage drive, and the first liquid crystal phase variable retarder voltage drive, the second liquid crystal phase variable retarder voltage drive and the third liquid crystal phase variable retarder voltage drive are all connected with a computer.
Further, the polarization direction of the 0-order transmission light emitted from the second acousto-optic tunable filter is rotated by 90 ° after the 0-order transmission light is modulated by the third liquid crystal phase variable retarder.
Further, the light source is used for generating incident light, and the light source is a coherent light source or an incoherent light source.
Further, the light source is an artificial light source, or reflected, transmitted or radiated light of a far-field target.
Furthermore, a light source intensity controller is connected to the light source, and the artificial light source intensity controller is connected to the computer.
Compared with the prior art, the invention has the advantages that:
1. the polarization control unit consists of a first liquid crystal phase variable retarder and a second liquid crystal phase variable retarder, and a first acousto-optic tunable filter and a second acousto-optic tunable filter form a hyperspectral control unit; after incident light is modulated into linearly polarized light by the polarizing prism, voltages are applied to the first liquid crystal phase variable retarder and the second liquid crystal phase variable retarder to control the retardation of the incident light phase, four Stokes parameters are measured at the same time, secondary filtering is carried out by the two acousto-optic tunable filters, and finally narrowband diffracted light is received by the imaging detector. The high-spectrum polarization imaging can be carried out on the measured target, the energy feedback technology is utilized, the finally output narrow-band diffraction light intensity is highest, and the high-spectrum resolution and polarization detection capability are achieved.
2. The polarization detection device of the invention is not limited to near-field target test, and can also be applied to far-field target measurement. In the identification of the near-field actual sample, a sample to be detected is placed between a front collimation system and a polarizing prism, and a light source intensity controller is adopted to adjust incident light to appropriate intensity to irradiate the sample; in far field target testing, the light source and intensity modulator are removed and the reflected, radiated or transmitted light from the far field target is collimated and enters the system for acousto-optic interaction.
3. The acousto-optic tunable filter has a faster spectral electrical tuning speed than a polaroid and LCTF, is small and compact in structure, and can be combined with a liquid crystal phase variable retarder to detect the circular polarization component in a Stokes vector of a target, so that full polarization information of a scene can be obtained.
4. The 0-level transmission light coming out of the second acousto-optic tunable filter is quasi-monochromatic light, the polarization direction of the 0-level transmission light can be rotated by pi/2 after being modulated by the liquid crystal phase variable retarder, and acousto-optic interaction can happen in the first acousto-optic tunable filter after passing through the second 2 x 1 optical fiber coupler and the first 2 x 1 optical fiber coupler respectively.
5. All optical elements in the polarization detection process do not need to be manually adjusted, the whole working process is finished under the control of a computer, and the polarization detection device is convenient to operate and time-saving and labor-saving.
Drawings
Fig. 1 is a schematic structural diagram of a dual-filtering energy feedback type hyperspectral imaging device based on acousto-optic modulation.
In the figure: 1-a light source; 2-a polarizing prism; 3-light source intensity controller; 4-a first liquid crystal phase variable retarder; 5-a second liquid crystal phase variable retarder; 6-first liquid crystal phase variable retarder voltage drive; 7-second liquid crystal phase variable retarder voltage drive; 8-a first 2 x 1 fiber coupler; 9-a first acousto-optic tunable filter; 10-second acousto-optic tunable filter; 11 — a first radio frequency driver; 12-a second radio frequency driver; 13-a third liquid crystal phase variable retarder; 14-third liquid crystal phase variable retarder voltage drive; 15-a second 2 x 1 fiber coupler; 16-a detector; 17-high speed image acquisition card; 18-computer.
Detailed Description
The invention is described in detail below with reference to the following figures and specific examples:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
Referring to fig. 1, the dual-filter energy feedback type hyperspectral imaging device based on acousto-optic modulation comprises a light source 1 and a polarizing prism 2 arranged on an incident light path of the light source, wherein a light source intensity controller 3 is connected to the light source 1, and the light source intensity controller 3 is connected with a computer 18. Incident light is modulated into linearly polarized light through a polarizing prism 2, the linearly polarized light sequentially passes through a first liquid crystal phase variable retarder 4 and a second liquid crystal phase variable retarder 5 and then enters a first 2 x 1 optical fiber coupler 8, light emitted from the first 2 x 1 optical fiber coupler 8 enters a first acousto-optic tunable filter 9, a first radio-frequency driver 11 is connected onto the first acousto-optic tunable filter 9, the first radio-frequency driver 11 is connected with a computer 18, the computer 18 controls the first radio-frequency driver 11 to generate high-frequency ultrasonic waves to generate acousto-optic interaction with the incident light, 0-level transmission light emitted from the first acousto-optic tunable filter 9 is transmitted into a second 2 x 1 optical fiber coupler 15 through optical fibers, and diffracted light emitted from the first acousto-optic tunable filter 9 enters a second acousto-optic tunable filter 10;
the second acousto-optic tunable filter 10 is connected with a second radio frequency driver 12, the second radio frequency driver 12 is connected with a computer 18, the computer 12 controls the second radio frequency driver 10 to generate high-frequency ultrasonic waves to perform acousto-optic interaction with diffracted light emitted by the first acousto-optic tunable filter 9, 0-order transmitted light emitted by the second acousto-optic tunable filter 10 is transmitted to a third liquid crystal phase variable retarder 13 connected with the computer 18 through an optical fiber, the polarization direction of the 0-order transmitted light modulated by the third liquid crystal phase variable retarder 13 is rotated by 90 degrees and then enters a second 2 x 1 optical fiber coupler 15, the diffracted light emitted by the second acousto-optic tunable filter 10 passes through a high-speed image acquisition card 17 and then is received by a detector 16, and the detector 16 transmits the obtained spectral imaging to the computer 18 connected with the detector 16; the vibration direction of the 0-level transmission light emitted by the second acousto-optic tunable filter 10 after modulation is the same as the vibration direction of the 0-level transmission light emitted by the first tunable filter 9, and the two beams of 0-level transmission light are transmitted to the first 2 x 1 optical fiber coupler 8 through the optical fiber after being combined by the second 2 x 1 optical fiber coupler 15 to generate acousto-optic interaction again;
the first liquid crystal phase variable retarder 4 is connected with a first liquid crystal phase variable retarder voltage drive 6, the second liquid crystal phase variable retarder 5 is connected with a second liquid crystal phase variable retarder voltage drive 7, the third liquid crystal phase variable retarder 13 is connected with a third liquid crystal phase variable retarder voltage drive 14, and the first liquid crystal phase variable retarder voltage drive 6, the second liquid crystal phase variable retarder voltage drive 7 and the third liquid crystal phase variable retarder voltage drive 14 are all connected with a computer 18. The first liquid crystal phase variable retarder 4, the second liquid crystal phase variable retarder 5, and the third liquid crystal phase variable retarder 13 are respectively rendered different phase retardations at specific wavelengths by modulating voltages.
After the incident light is modulated into linearly polarized light by the polarizing prism, the linearly polarized light is subjected to phase delay through the two liquid crystal phase variable retarders, secondary filtering is performed through the two acousto-optic tunable filters, and finally the narrow-band diffracted light is received by the imaging detector. Firstly, a preset program is used for controlling a polarization device to carry out phase modulation on polarization information carried by reflection, scattering or transmission light of a detected target, and a computer is used for applying voltage to a first liquid crystal phase variable retarder and a second liquid crystal phase variable retarder to control the delay amount of an incident light phase, such as 0, pi/2 and the like, which can be any amount, so that full Stokes parameters, polarization degree and polarization angle information are obtained; and then selecting the diffraction wavelength and the intensity value which are required to be obtained by tuning the frequency and the power of the radio frequency signal, finally collecting the diffraction signal by using a detector, and storing an output spectrum image of the system into a computer.
The high-spectrum polarization imaging can be carried out on the measured target, the 0-level transmission light emitted by the two acousto-optic tunable filters is utilized for feedback compensation, the finally output narrow-band diffraction light intensity is highest, and the high-spectrum polarization imaging device has high spectrum resolution and polarization detection capability.
In the identification of the near-field actual sample, a sample to be detected is placed between a front collimation system and a polarizing prism, and a light source intensity controller is adopted to adjust incident light to appropriate intensity to irradiate the sample; the hyperspectral imaging device is not limited to near-field target testing, and can also be applied to far-field target measurement. In far field target testing, the light source and intensity modulator are removed and the reflected, radiated or transmitted light from the far field target is collimated and enters the system for acousto-optic interaction.
It should be noted that the above-mentioned only shows the preferred embodiments of the present invention, and that several variations and modifications can be made by those skilled in the art without departing from the inventive concept of the present invention.
Claims (5)
1. The utility model provides a pair of filter energy feedback type hyperspectral imaging polarization detection device which characterized in that: the device comprises a polarizing prism (2) arranged on an incident light path, incident light is modulated into linearly polarized light through the polarizing prism (2), the linearly polarized light sequentially passes through a first liquid crystal phase variable retarder (4) and a second liquid crystal phase variable retarder (5) and then enters a first 2 x 1 optical fiber coupler (8), light emitted from the first 2 x 1 optical fiber coupler (8) enters a first acousto-optic tunable filter (9), a first radio frequency driver (11) is connected onto the first acousto-optic tunable filter (9), the first radio frequency driver (11) is connected with a computer (18), the computer (18) controls the first radio frequency driver (11) to generate high-frequency ultrasonic waves to generate acousto-optic interaction with the incident light, and 0-level transmission light emitted from the first acousto-optic tunable filter (9) is transmitted into a second 2 x 1 optical fiber coupler (15) through optical fibers, diffracted light emitted from the first acousto-optic tunable filter (9) enters a second acousto-optic tunable filter (10);
the second radio frequency driver (12) is connected to the second acousto-optic tunable filter (10), the second radio frequency driver (12) is connected to the computer (18), the computer (18) controls the second radio frequency driver (12) to generate high-frequency ultrasonic waves to perform acousto-optic interaction with diffracted light emitted from the first acousto-optic tunable filter (9), 0-level transmitted light emitted from the second acousto-optic tunable filter (10) is transmitted to a third liquid crystal phase variable retarder (13) connected to the computer (18) through an optical fiber to be modulated and then enters a second 2 x 1 optical fiber coupler (15), diffracted light emitted from the second acousto-optic tunable filter (10) is received by a detector (16) after passing through a high-speed image acquisition card (17), and the detector (16) transmits the obtained spectral imaging to a computer (18) connected with the detector (16); two beams of 0-level transmission light are transmitted to the first 2 x 1 optical fiber coupler (8) through optical fibers after being combined by the second 2 x 1 optical fiber coupler (15) to generate acousto-optic interaction again;
the first liquid crystal phase variable retarder (4) is connected with a first liquid crystal phase variable retarder voltage driver (6), the second liquid crystal phase variable retarder (5) is connected with a second liquid crystal phase variable retarder voltage driver (7), the third liquid crystal phase variable retarder (13) is connected with a third liquid crystal phase variable retarder voltage driver (14), and the first liquid crystal phase variable retarder voltage driver (6), the second liquid crystal phase variable retarder voltage driver (7) and the third liquid crystal phase variable retarder voltage driver (14) are all connected with a computer (18).
2. The dual-filter energy feedback type hyperspectral imaging polarization detection device according to claim 1, wherein: the polarization direction of 0-order transmission light emitted from the second acousto-optic tunable filter (10) is rotated by 90 DEG after the 0-order transmission light is modulated by the third liquid crystal phase variable retarder (13).
3. The dual-filter energy feedback type hyperspectral imaging polarization detection device according to claim 1 or 2, wherein: also included is a light source (1) for generating incident light, the light source (1) being a coherent light source or an incoherent light source.
4. The dual-filter energy feedback type hyperspectral imaging polarization detection device according to claim 3, wherein: the light source (1) is an artificial light source, or a reflected, transmitted or radiated light of a far-field target.
5. The dual-filter energy feedback type hyperspectral imaging polarization detection device according to claim 4, wherein: the artificial light source is connected with a light source intensity controller (3), and the light source intensity controller (3) is connected with a computer.
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| US4622845A (en) * | 1985-03-21 | 1986-11-18 | Westinghouse Electric Corp. | Method and apparatus for the detection and measurement of gases |
| US5483338A (en) * | 1994-05-26 | 1996-01-09 | Martin Marietta Energy Systems, Inc. | Method and apparatus for evaluating structural weakness in polymer matrix composites |
| CN102175321A (en) * | 2011-01-31 | 2011-09-07 | 重庆大学 | Multi-target imaging spectrograph based on grating moving light modulator (GMLM) |
| 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 |
| CN105717076A (en) * | 2016-05-04 | 2016-06-29 | 中北大学 | Spectrum SPR imaging sensing system based on acousto-optic light filtration |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4622845A (en) * | 1985-03-21 | 1986-11-18 | Westinghouse Electric Corp. | Method and apparatus for the detection and measurement of gases |
| US5483338A (en) * | 1994-05-26 | 1996-01-09 | Martin Marietta Energy Systems, Inc. | Method and apparatus for evaluating structural weakness in polymer matrix composites |
| CN102175321A (en) * | 2011-01-31 | 2011-09-07 | 重庆大学 | Multi-target imaging spectrograph based on grating moving light modulator (GMLM) |
| 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 |
| CN105717076A (en) * | 2016-05-04 | 2016-06-29 | 中北大学 | Spectrum SPR imaging sensing system based on acousto-optic light filtration |
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