Polarization imaging system

Abstract

The invention provides a polarization imaging system. The polarization imaging system comprises a front lens group, a filter element, a relay lens group and a photoelectric detector, wherein the relaylens group adopts a double-telecentric optical path, the front lens group and the filter element are respectively located at the object side of the relay lens group, the photoelectric detector is located at the image side of the relay lens group, the image plane of the front lens group coincides with the front focal plane of the relay lens group, and the filter element is located at the image plane position of the front lens group; and the target light is focused to the front focal plane of the relay lens group through the front lens group for primary imaging to form a first image, and the first image is subjected to secondary imaging at the photoelectric detector through twice Fourier transform of the relay lens group after invalid information of the first image is filtered by the lightfiltering element. According to the invention, the optical crosstalk can be reduced to a reasonable level, the energy concentration ratio of the target is improved, and the method has the characteristics of high signal-to-noise ratio, high degree of freedom and high spatial resolution. And meanwhile, the filters with different functions are switched at the image plane position of the front lens group, so that imaging in multiple modes can be realized.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a multi-mode and common-aperture polarization imaging system. Background technique [0002] The polarization imaging system can provide multi-dimensional target information and effectively improve the detection and recognition capabilities of stealth and camouflaged targets. It is widely used in the field of airborne photoelectric load detection and can make up for the shortcomings of traditional remote sensing technology in target detection. The polarization imaging system divides the frequency spectrum of the target image through polarizing elements, captures all polarization modulation components through polarizing elements with different polarization characteristics, and obtains the polarization state of the target light source through calculation, so as to distinguish between artificial targets and natural scenery, and to achieve the goal in the cluttered back...

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the technical problems of optical crosstalk and single imaging mode in the traditional polarization imaging system, and provides a multi-mode common-aperture polarization imaging system, which uses the conjugate relationship of the double telecentric optical path to expand the unit size area of ​​the filter element , to reduce the optical crosstalk between the pixels of the filter element, while maintaining the same spatial resolution and improving the imaging quality of the system

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