CN105157836B - Optical spectrum imaging device and its method that a kind of polarization state is synchronously obtained - Google Patents
Optical spectrum imaging device and its method that a kind of polarization state is synchronously obtained Download PDFInfo
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Abstract
The present invention provides optical spectrum imaging device and its method that a kind of polarization state is synchronously obtained, with moving component is not present in higher capacity usage ratio and real-time, and device, with extraordinary stability.The polarization spectrum imaging device, main preposition optical system, SAGNAC interferometers, 2X2 fourier lens array, polarizing diaphragm and the detector assembly for including setting gradually along light path, target light enters SAGNAC interferometers by preposition optical system, transflection is produced on the beam-splitting surface of SAGNAC interferometers than being respectively 50% two-beam, from the light beam of SAGNAC interferometer outgoing again after 2X2 fourier lens array, polarizing diaphragm, interference fringe is produced on the photosurface of detector assembly；Wherein, polarizing diaphragm corresponds to the region that 2X2 fourier lens arrays are configured to four different polarization states.
Description
Technical field
The present invention relates to a kind of polarization spectrum imaging device and method.
Background technology
Light spectrum image-forming and polarization imaging, which are combined, forms a kind of new optical remote sensing technology --- polarization spectrum imaging skill
Art, image information, spectral information and the polarization state information that the technology can collect target is melted into a whole.Light spectrum image-forming kind equipment may
In the presence of " same object different images " and the phenomenon of " the different spectrum of jljl ", certain limitation is there may be in terms of the precision of identification target；
Added in image and spectral information after polarization information, can reach optimal detection and recognition capability.It is particluarly suitable for turbid media
Target acquisition under the conditions of (cigarette, mist, haze, dirt, water body etc.) etc., also due to " strong light reduction " that polarization state possesses and " dim light is strong
Change " feature, can greatly extend remote sensing it is dark-detecting area at bright two ends.Meanwhile, essence can be carried out to atmospheric attenuation with polarization means
Really portray and law discovery, objective basis can be provided for new atmospheric window theory.
At present, polarization spectrum imaging detection method mainly has following several ways：
1st, the polarization spectrum imaging method based on AOTF (acousto-optic tunable) and LCTF (liquid crystal tunable)
The principle is the selection using acoustooptic diffraction principle and with liquid crystal electric tuning principle progress spectrum, meanwhile, adopt
The measurement for carrying out polarization state is combined with phase delay device LCVR etc., it has the disadvantage the measurement for being only used for static object, is not inconsistent
Close the demand of dynamic application target and real-time.
2nd, the polarization spectrum imaging method of calculating computed tomography type
The detection of polarization state and spectral information, shortcoming are carried out by installing the polarizer and wave plate in multiple different polarization directions
Be measuring polarization state time it is long, have moving component, under the conditions of polarization state is fast-changing do not apply to.
3rd, the spectrum polarizing method based on slit dispersion
This method uses polarization-spectral intensity modulation technique, by being added in common slit dispersive spectrometer light path
Spectral modulation module realizes the measurement of polarization state, and the shortcoming of this method is that system uses slit, and capacity usage ratio is than relatively low, together
There is aliasing in Shi Guangpu.
4th, the polarization spectrum imaging method based on polarization grating
The program employs a kind of sensitive grating of new transmission-type anisotropic polarization, and the grating can realize polarization dimension
The separation tieed up with spectrum, but there is aliasing in terms of spectrum acquisition in the system, and the measurement of polarization state is needed by combining meter
Calculate, meanwhile, there is slit in the system, capacity usage ratio is not high.
The content of the invention
The present invention provides optical spectrum imaging device and its method that a kind of polarization state is synchronously obtained, with higher energy utilization
Moving component is not present in rate and real-time, and device, with extraordinary stability.
Technical scheme is as follows：
A kind of polarization spectrum imaging device, the main preposition optical system for including setting gradually along light path, SAGNAC interference
Instrument, 2X2 fourier lens array, polarizing diaphragm and detector assembly, target light are interfered by preposition optical system into SAGNAC
Instrument, produces transflection than being respectively 50% two-beam, from the light of SAGNAC interferometer outgoing on the beam-splitting surface of SAGNAC interferometers
After 2X2 fourier lens array, polarizing diaphragm, interference fringe is produced on the photosurface of detector assembly again for beam；Wherein, polarize
Diaphragm corresponds to the region that 2X2 fourier lens arrays are configured to four different polarization states.
The incident light of SAGNAC interferometers is non-interfering, and emergent light is the light beam cut by wavelength Transverse Shear, by Fu
After family name's lens array, into the picture (to more than 200 times focal lengths) of four Same Scene targets, such identical picture in each image planes
By the polarizing diaphragm of four quadrants, so that it may obtain the target interference pattern under four polarization states.
Based on above scheme, the present invention further makees following optimization：
The region of aforementioned four different polarization states is laid out in sphere of movements for the elephants type.So, detector target surface can be made full use of.
The configuration mode in four regions of above-mentioned polarizing diaphragm preferably following two patterns：
(1) 0 degree, 45 degree, 90 degree, 135 degree of linear polarization acquisition modes are respectively configured as.
(2) three regions are respectively configured as any three kinds of 0 degree, 45 degree, 90 degree, 135 degree linear polarization acquisition modes, separately
One region is configured to circular polarization state acquisition modes.
The method that spectrum polarizing image detection is realized using above-mentioned polarization spectrum imaging device, including procedure below：Target
Light is after preposition optical system, into SAGNAC interferometers, and transflection is produced on the beam-splitting surface of SAGNAC interferometers and is than respectively
50% two-beam, after 2X2 fourier lens array, polarizing diaphragm, interference fringe is produced on the photosurface of detector assembly,
The interference fringe is the interference polarization figure for being superimposed scene information, and interference polarization figure carries out spectrum by data handling system and answered
After original, the image of target four direction polarization state under different spectral coverage is drawn.
Compared with traditional approach, advantage of the invention is as follows：
1st, the detection method compares traditional slit polarization spectrum imaging method, with very high capacity usage ratio.
When carrying out polarization state acquisition, typically can all have very big energy loss, this is to the light spectrum image-forming with slit
It is the factor that emphasis considers for system progress polarization state detection, is typically necessary indemnifying measure；But compensation means that introducing
Timesharing detection.The present invention without energy compensating, realizes the energy loss of measuring polarization state and big in actual spectrum detection
The complementation of high-energy utilization rate of the aperture without slit.
2nd, traditional approach is timesharing, nonsynchronous measurement, and it is synchronous acquisition that polarization state of the present invention, which is obtained, with very good
Real-time.
3rd, traditional approach needs rotatory polarization wheel or wave plate, and moving component is not present in the present invention, with extraordinary
Stability.
Brief description of the drawings
Fig. 1 is system block diagram of the invention.
Embodiment
The polarization spectrum imaging detection system of the present invention is main by preposition optical system 1, SAGNAC interferometers 2,2X2 fourier
Mirror (imaging lens) array 3, polarizing diaphragm 4, detector assembly 5, data handling system 6 are constituted.Detection mode is as follows：Target reflects
Light is after preposition optical system 1, into SAGNAC interferometers 2, and transflection is produced on interferometer beam-splitting surface than being respectively 50%
Two-beam, after 2X2 fourier mirror (imaging lens) array 3, polarizing diaphragm 4, interference fringe is produced on detector photosurface, should
Interference fringe is the interference polarization figure for being superimposed scene information, and interference pattern is after data handling system 6 carries out spectrum recovering, just
Target is obtained under different spectral coverage, the image of four direction polarization state, the polarizing diaphragm 4 can be configured to 0 degree, 45 degree, 90 degree,
135 degree of polarization state acquisition modes, may also be configured to wherein any 3 linear polarizations and circular polarization state acquisition modes.
Claims (5)
1. a kind of polarization spectrum imaging device, it is characterised in that：Including set gradually along light path preposition optical system, SAGNAC
Interferometer, 2X2 fourier lens array, polarizing diaphragm and detector assembly, target light enter SAGNAC by preposition optical system
Interferometer, produces transflection than being respectively 50% two-beam, from SAGNAC interferometer outgoing on the beam-splitting surface of SAGNAC interferometers
Light beam again after 2X2 fourier lens array, polarizing diaphragm, produce interference fringe on the photosurface of detector assembly；Wherein,
Polarizing diaphragm corresponds to the region that 2X2 fourier lens arrays are configured to four different polarization states.
2. polarization spectrum imaging device according to claim 1, it is characterised in that：The region of four different polarization states
It is laid out in sphere of movements for the elephants type.
3. polarization spectrum imaging device according to claim 1, it is characterised in that：Match somebody with somebody respectively in four regions of polarizing diaphragm
It is set to 0 degree, 45 degree, 90 degree, 135 degree of linear polarization acquisition modes.
4. polarization spectrum imaging device according to claim 1, it is characterised in that：In four regions of polarizing diaphragm, have
Three regions are respectively configured as any three kinds of 0 degree, 45 degree, 90 degree, 135 degree linear polarization acquisition modes, and another region is matched somebody with somebody
It is set to circular polarization state acquisition modes.
5. the method that spectrum polarizing image detection is realized using the polarization spectrum imaging device described in claim 1, including it is following
Process：Target light is after preposition optical system, into SAGNAC interferometers, is produced on the beam-splitting surface of SAGNAC interferometers saturating
Inverse ratio is respectively 50% two-beam, after 2X2 fourier lens array, polarizing diaphragm, is produced on the photosurface of detector assembly
Interference fringe, the interference fringe is the interference polarization figure for being superimposed scene information, and the interference polarization figure passes through data handling system
Carry out after spectrum recovering, draw the image of target four direction polarization state under different spectral coverage.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106052550A (en) * | 2016-04-29 | 2016-10-26 | 合肥工业大学 | Simplified Sagnac interference element based on reflective blazed gratings |
| CN110207823A (en) * | 2019-03-19 | 2019-09-06 | 天津大学 | Four polarization state of medium-wave infrared while imaging optical system |
| CN110987186B (en) * | 2019-11-21 | 2021-01-15 | 中国科学院西安光学精密机械研究所 | Birefringent interferometer adjusting device and method based on optical path difference indication |
| CN113495359B (en) * | 2020-03-19 | 2022-10-04 | 中国科学院西安光学精密机械研究所 | Wide-spectrum common-path 3-D angle mirror zero-eliminating interferometer |
| CN111562002B (en) * | 2020-04-22 | 2021-04-20 | 中国科学院西安光学精密机械研究所 | High-flux high-resolution high-contrast polarization interference spectrum imaging device and method |
| CN111707367A (en) * | 2020-05-08 | 2020-09-25 | 中国科学院西安光学精密机械研究所 | Polarization spectrum imaging device and method based on M-Z interference |
| CN111735539A (en) * | 2020-06-29 | 2020-10-02 | 中国科学院西安光学精密机械研究所 | Spectrum imaging detection device based on polarization synchronous modulation and adjustable filtering |
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| CN102865811B (en) * | 2012-09-29 | 2015-04-15 | 哈尔滨工程大学 | Orthogonal double grating based synchronous phase shifting common-path interference microscopy detection device and detection method |
| WO2014145792A1 (en) * | 2013-03-15 | 2014-09-18 | Polaris Sensor Technologies, Inc. | Long wave infrared imaging polarimeter, and method of assembly |
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