Hyperspectral all-polarization imaging device and method based on symmetrical wedge-shaped interference cavity

Abstract

The invention relates to a hyperspectral all-polarization imaging device and method based on a symmetrical wedge-shaped interference cavity. The device comprises a front imaging objective, a symmetrical wedge-shaped interference cavity system, a micro polarization modulation array, a detector and a signal processing system which are sequentially placed in a light path direction. The method comprises steps as follows: Step one, incident light arrives at the symmetrical wedge-shaped cavity via the front imaging objective to form multi-beam interference; Step two, beams pass through the micro polarization modulation array, and a same object point generates four polarization-state interference image points on a target surface of the detector simultaneously after modulated by four polarization pixels of the micro polarization modulation array; Step three, four groups of polarization interference information of a target point under different light path differences are acquired through push-scanning; Step four, the signal processing system acquires two-dimensional light intensity information of a scene, spectral information and all polarization parameters of each spectral segment after spectrum recovery and polarization information reconstruction. The method has the advantages that the spectrum resolution, the light flux and the target resolution are high, the spectrum information and polarization information can be acquired synchronously and the like.

Description

technical field [0001] The invention relates to the field of optical target detection, in particular to a hyperspectral full-polarization imaging device and imaging method based on a symmetrical wedge-shaped interference cavity. Background technique [0002] Interferometric imaging spectroscopy mainly includes three types of techniques: time modulation, space modulation and space-time joint modulation. Among them, the space-time joint modulation technology is a very active spectral detection technology in the field of spectral imaging. It introduces the interference information of the detection target by adding a transverse shearing beam splitter in the infinite-distance imaging system, and uses Fourier transform inversion processing to obtain the two-dimensional spatial light intensity information and spectral information of each point of the detection target. Compared with the time-modulated interferometric imaging spectrometer, the push-broom moving parts can be removed ...

AI Technical Summary

Problems solved by technology

[0004] In addition, the traditional imaging spectral polarization technology based on two-beam interference, such as Michelson interferometry, Sagnac triangular co-path interferometry, and Mach-Zehnder interferometry, cannot meet the requirements of a straight optical path, so it is difficult to achieve miniaturization of the optical system. It is suitable for fields with strict load weight and volume requirements such as drone detection

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