Polarization precision scaling system for polarization optical spectrometer

Abstract

A polarization precision calibrating system of a polarity spectrometer comprises an integrating sphere, a collimator tube, a diaphragm, an interference absorber, a polarization state generator (PSG), a polarization-preserving diffuser, a collimating lens, a polarization state detector, a reference light intensity probe and a computer. The calibrating system adopts the integrating sphere, the collimator tube, the diaphragm, the interference absorber and the polarization state generator (PSG) to generate standard polarization calibration sources; and a zero vision field and a small-caliber parallel light beam generated by the calibration sources are expanded into a full vision field and a large-caliber parallel light beam with the same polarization state, so as to carry out full vision calibration to the large-caliber polarity spectrometer. The invention has a capacity of carrying out the full vision polarization calibration to the large-caliber polarity spectrometer, adopts a unequally accurate least square principle to process data during the calibration process, and greatly improves the polarization calibration accuracy of an imaging polarity spectrometer.

Description

technical field [0001] The invention relates to a polarization precision calibration system for an imaging polarization spectrometer used for space-borne, airborne and ground-to-ground remote sensing and deep space exploration. Background technique [0002] Imaging spectral polarization detection technology is of great value in the detection of clouds and atmospheric aerosols, geological exploration, soil analysis, environmental monitoring, resource investigation, crop yield estimation, disaster estimation, agricultural and animal husbandry development, marine development and utilization, and military fields. In order to better apply the imaging spectral polarization detection system and obtain accurate spectral polarization information of the target, it is necessary to carry out polarization calibration, and establish the relationship between the output signal of each detection unit of the imaging spectral polarization detection system and the actual ground object polarizati...

AI Technical Summary

Problems solved by technology

When the traditional polarization calibration system calibrates the polarization spectrometer, it rotates the polarization spectrometer step by step so that parallel light is incident on the calibrated system at various viewing angles, so as to realize polarization calibration at each viewing angle. This kind of calibration method cannot carry out accurate polarization calibration for the polarization spectrometer

[0007] To sum up, the current polarization calibration systems developed at home and abroad cannot perform polarization calibration for large-aperture polarization spectrometers, and cannot perform accurate full-field polarization calibration for polarization spectrometers

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