Multi-aperture polarization imaging device and system

Abstract

The invention discloses a multi-aperture polarization imaging device which includes a micro lens array, a detector array, and at least three polarizing plates. The micro lens array includes a plurality of micro lenses which are distributed on a first spherical surface and used for receiving external target light information. The detector array is disposed behind the micro lens array, and includesa plurality of detectors. The detectors and the micro lenses are set in a one-to-one correspondence manner. The detectors are distributed on a second spherical surface concentric with the first spherical surface, and are used for imaging the target light information passing through the micro lenses to acquire first image information. The polarizing plates are disposed in front of the micro lens array, and are distributed at the center of the micro lens array. Each polarizing plate corresponds to one micro lens at the center. The polarizing plates are used for acquiring second image informationin different polarization directions. The two adjacent micro lenses at the center have a field-of-view overlap at a predetermined ratio. With the device of the invention, target location information,intensity information and target material information can be accurately acquired.

Description

Technical field [0001] The invention relates to the field of photoelectric detection, in particular to a multi-aperture polarization imaging device and system. Background technique [0002] At present, the main polarization imaging detection methods include timing method, beam splitter beam splitting, multi-aperture large area array method and split-aperture imaging. The sequential method is based on time-sharing imaging technology. This method fixes the polarizer in front of the imaging system and manually / electrically rotates the polarizer to different linear polarization directions to obtain images of different polarization states. This method is simple and easy to implement, real-time Poor performance, unable to image changing scenes or moving targets. The polarization imaging technology of beam splitter uses a polarization beam splitter or a beam splitter and multiple polarizers to split the target beam into multiple polarized light beams, and uses multiple detectors to ima...

AI Technical Summary

Problems solved by technology

The time-sequential method is based on time-sharing imaging technology. In this method, the polarizer is fixed in front of the imaging system, and images of different polarization states are obtained by manually / electrically rotating the polarizer to different linear polarization directions. This method is simple and easy, real-time Poor performance, unable to image changing scenes or moving targets

The polarization imaging technology of beam splitting uses polarization beam splitting prisms or beam splitting mirrors and multi-polarizers to split the target beam into multiple beams of polarized light, and uses multi-detectors to image the same scene in real time. Usually, each detector measures the One polarization state, but because the optical path loss is increased by the way of multi-channel beam splitting, and the light energy detected by a single channel is greatly reduced, the detection difficulty increases

[0003] Patent CN101806959 discloses a real-time small polarization imaging device, which obtains 4 polarization images at the same time through 4 polarizers placed behind the lens array and a large area array detector, because the optical axes of the 4 lenses are not on the same straight line In general, it is difficult to synchronize the imaging quality of the four images when received by the same large area array detector, and it is very likely that the image planes overlap

[0004] Patent CN102944937 discloses a sub-aperture polarization imaging system, which uses a polarizer array to obtain the polarization information of the target, but the telephoto objective lens, optical filter, field diaphragm, field mirror and collimator before the polarizer array in the above-mentioned patent The straight modules all use the same optical path. After the aperture is divided, the light energy of each aperture is limited. At the same time, the common information of each sub-image is less, and it is difficult to perform polarization processing.

[0005] To sum up, the existing technology has low imaging quality and complicated polarization processing, which leads to the inaccurate acquisition of target position information, intensity information and target material information

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