Sub-aperture polarization imaging system

Abstract

The invention discloses a sub-aperture polarization imaging system. The sub-aperture polarization imaging system comprises a telephoto objective, an optical filter, a field stop, a field lens, a collimation module, an aperture dividing module, a focusing imaging module and a charge coupled device (CCD) detector which are coaxially arranged in the incident light spreading direction. The sub-aperture polarization imaging system achieves sub-aperture polarization imaging by aid of an optical imaging system, removes spherical aberration and comatic aberration by aid of the correction field curvature of the focusing imaging module, and accordingly improves imaging quality and prevents the image surfaces from being overlapped. When the imaging environment is dark, three linear polaroids with different polarization angles (0 degree, 60 degrees and 120 degrees respectively) can be placed in a polarization array, and the remained aperture is used for non-polarization imaging. According to the sub-aperture polarization imaging system, the influence of imaging illumination is considered on the condition of not changing the system structure, and accordingly energy loss of light caused by the polaroids is made up.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a sub-aperture polarization imaging system. Background technique [0002] There are mainly three existing polarization imaging methods. One is based on time-sharing imaging technology. In this method, the polarizer is fixed in front of the imaging system, and different polarization states are obtained by manually or electrically rotating the polarizer to different linear polarization directions. The other is an imaging technology based on wavefront beam splitting. This method uses a beam splitter to split the target beam into multiple beams, and uses multiple polarizers and multiple detectors to image the same scene in real time. Usually, each A detector measures a polarization state of the scene; the third is a real-time small polarization imaging device disclosed in the application number 200910237178.7, which includes a lens array, a polarizer array and a large...

AI Technical Summary

Problems solved by technology

[0003] The method based on time-sharing is simple and easy to implement, but at the cost of loss of time resolution, it cannot image changing scenes or moving targets, the real-time performance is poor, and there are registration problems of multi-polarization images

The method based on wavefront beam splitting solves the problem of multi-polarization real-time imaging, but due to the multi-optical path and multi-detector structure, the system is bulky, inconvenient to install and adjust, and expensive

The third type of polarization imaging device has made great technological progress compared with the first two, but because the device uses 4 lenses to directly image the 4 polarized lights corresponding to it, since the optical axes of the 4 lenses are not on the same straight line , the imaging quality is very poor when receiving with the same large area array CCD, and it is very likely that the overlapping of image planes will occur

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