Image-spectrum-polarization-state integrated obtaining apparatus and method

Abstract

The invention discloses an image-spectrum-polarization-state integrated obtaining apparatus and method. A front-end telescopic system, a lambda / 4 wave plate for achromatism, a phase delay, a polarizing film array, a half-wave plate for achromatism, a Wollaston prism, a Savart polariscope, a phase delay, an analyzer LA, an imaging mirror group, and a plane array CCD are arranged from left to right by using a main optical axis as a center along a propagation direction of incident light. Two pairs of dual-channel complementary interferograms are obtained respectively at an upper subarea and a lower subarea of the CCD and the four interferograms are added to obtain target image; pure interference fringes are obtained by subtraction of the interferograms; and the pure interference fringes are added and subtracted to keep single-channel interference fringes and fourier transform is carried out to obtain traditional intensity spectrum and linear polarization spectrum information of a target. Channel filtering of optical path difference dimension is avoided during the spectrum recovery process; and the background noises are inhibited from the hardware.

Description

【Technical field】 [0001] The invention belongs to the field of optical devices, and relates to an image, spectrum and polarization state integrated acquisition device and method. 【Background technique】 [0002] Imaging Spectropolarimeter (ISP) is a new type of detection instrument that combines the functions of camera, spectrometer and polarimeter, and can simultaneously acquire the image, spectrum and polarization information of the target. ISP extends the three-dimensional information (one-dimensional spectrum and two-dimensional space) obtained by imaging spectrometer or the three-dimensional information (one-dimensional polarization and two-dimensional space) obtained by imaging polarimeter to four-dimensional (one-dimensional spectrum, two-dimensional space and one-dimensional polarization information) ), providing a richer source of information for target detection and identification, and will play an important role in military reconnaissance, camouflage recognition, g...

AI Technical Summary

Problems solved by technology

The ISP based on channel spectroscopy technology and static interferometric imaging spectroscopy technology has the advantages of good real-time performance, high stability, no electronic control components and a common optical path linear structure, etc., but the filtering of the optical path difference dimension reduces the maximum optical path difference to the original 1 / 7 or 1 / 3, according to the principle of Fourier transform spectroscopy, the resolution of the restored spectrum will be reduced to 1 / 7 or 1 / 3 of the original, seriously affecting the resolution of the restored spectrum

During channel modulation, due to the presence of spectral aliasing between channels, it is impossible to completely remove it by filtering, resulting in an irreversible error in the restoration of the Stokes vector spectrum; moreover, the acquired data contains both background images and interference fringes, and it is necessary to restore the spectrum Separate the background image from the interference fringes, otherwise the signal-to-noise ratio of the spectrum will be reduced, and the traditional background removal method has disadvantages such as large amount of calculation, zero point drift of optical path difference, and sensitivity to non-equal-amplitude spectral errors of coherent beams.

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