Fully polarized video imaging device using reflective phase retarder array
A phase retarder and imaging device technology, applied in polarization spectrum, measuring device, spectrum investigation, etc., can solve the problems of increasing the difficulty of data post-processing, the difficulty of installation and adjustment, and the poor imaging quality of edge parts, so as to improve the quality of optical imaging , fast and convenient data processing, good imaging effect
Active Publication Date: 2022-06-24
NANJING UNIV OF SCI & TECH
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[0003] According to the existing technology, polarization imaging technology is mainly divided into three types, time-domain modulation, frequency-domain modulation, and space modulation. The time-domain modulation polarization imaging system acquires images of different polarization states at different times, mainly through The rotating polarizing element obtains polarization information sequentially at different angles, but since multiple polarization images need to be obtained sequentially, the detection time is relatively long and it is only suitable for measuring stationary or slow-moving targets; the frequency-domain modulation polarization imaging system uses The beam device divides the original optical path into multiple paths modulated with polarization information. These paths converge on the image plane and are coherent, so as to obtain the interference pattern with the target polarization information, and then use the computer to solve the full polarization information of the target from the interference pattern, but The extraction of polarization images from the interferogram requires operations such as Fourier transform and inverse transform, which increases the difficulty of data post-processing, and the overall structure of the system is relatively complex, and it is difficult to install and adjust; the spatially modulated polarization imaging system uses multiple subsystems to acquire The intensity image array under different polarization states of the target, and finally the full polarization information of the target is obtained by calculation, which can realize simultaneous imaging, that is, multiple polarization images of the target can be obtained by one imaging, the system complexity is low, the structure is compact, and the data processing is simple, which is currently the main method used Polarization imaging method, but traditional spatially modulated polarization imaging such as sub-aperture polarization imaging systems still have shortcomings such as insufficient luminous flux and poor imaging quality at the edge
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[0012] combine figure 1 , the present invention adopts a fully polarized video imaging device of a reflective phase retarder array, including a front imaging objective lens 1, a diaphragm 2, a collimating objective lens 3, a narrow-band filter 4, and a reflective phase retarder sequentially arranged along the direction of the optical path. an array 5, a linear polarizer 6, a rear imaging objective lens 7 and an area array detector 8;
[0013] The pre-imaging objective lens 1 images the target at the aperture 2 set on the primary image plane. The aperture 2 limits the imaging range and then enters the collimating objective lens 3. The collimating objective lens 3 collimates the incident light beam and passes through the narrow-band filter 4. To the reflective phase retarder array 5, the reflective phase retarder array 5 changes the phase retardation of the incident light and reflects the light with different phase retardation to different directions, and all the reflected light...
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The invention discloses a full-polarization video imaging device adopting a reflective phase retarder array, which comprises a pre-imaging objective lens, a diaphragm, a collimating objective lens, a narrow-band filter, and a reflective phase retarder sequentially arranged along the direction of the optical path Array, linear polarizer, post-imaging objective lens and area array detector; the incident light is imaged at the diaphragm by the front-imaging objective lens, then collimated by the collimating objective lens, passes through a narrow-band filter, and then enters the reflective phase retarder array , the array changes the phase retardation of the incident light and reflects it in different directions. The reflected light is sequentially imaged on the area array detector through the linear polarizer and the post-imaging objective lens to form several spatially separated image areas. Each area Intensity images corresponding to different polarization states. The invention adopts a reflective phase retardation plate polarization imaging structure, only needs one exposure to obtain full polarization information of the target, and realizes full polarization video imaging. The device has high luminous flux, good imaging quality and simple structure.
Description
technical field [0001] The invention belongs to the field of spectral imaging detection, in particular to a fully polarized video imaging device using a reflective phase retarder array. Background technique [0002] The polarization characteristics of the target can provide information such as surface roughness, texture direction, surface orientation, etc. The polarization information generated by different objects or even the same object in different states will have certain differences. By observing the polarization characteristics of the target, the structural characteristics of the target can be determined. The full polarization video imaging technology can quickly obtain the full polarization information of the target, and has a wide range of applications in military target recognition, seismic exploration, map drawing, satellite remote sensing and many other fields. [0003] According to the prior art, polarization imaging technologies are mainly divided into three typ...
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IPC IPC(8): G01J3/447G01J3/28G01J3/02
CPCG01J3/447G01J3/2823G01J3/021
Inventor李建欣王宇博许逸轩刘杰卫明钱佳敏
OwnerNANJING UNIV OF SCI & TECH