Polarization Accuracy Calibration System for Large Field Polarization Spectrometer

Abstract

The invention provides a large view field type polarization spectrometer polarization accuracy calibration system which is composed of an integrating sphere, a collimator, a diaphragm, an interference filter, a polarization state generator (PSG), an electric turntable and a computer. The calibration system adopts the integrating sphere, the collimator, the diaphragm, the interference filter and the PSG to generate a standard polarization calibration source, and large view field type polarization spectrometer polarization calibration can be realized through small view field and small aperture type parallel beam generated by the calibration source through the divided view field and stepwise linear fitting method. According to the invention, full view field polarization calibration can be performed on large view field type polarization spectrometers, and the stepwise linear fitting principle is adopted in the calibration process to process data, so the large view field type imaging polarization spectrometer polarization calibration accuracy can be greatly imprived.

Description

technical field [0001] The invention relates to a polarization accuracy calibration system for a polarization spectrometer used for full-polarization and multi-spectrum imaging detection of sky light under a ground-based hemispherical field of view. Background technique [0002] For a long time, many scientists from various countries have devoted themselves to the research of sky light. In the early days, they mainly focused on explaining the phenomenon of sky light, such as the color of the sky and rainbows. After Arago discovered the polarization phenomenon of sky light in 1809, the research on the polarization characteristics of sky light began to be valued by some scientists. A large number of studies have shown that the polarization distribution information of sky light has very important value in aviation navigation, weather forecast, cloud analysis and ground information compensation. Whether the polarization distribution information of sky light can be accurately de...

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Problems solved by technology

[0004] To sum up, at present, a clear and high-precision polarization calibration system has not been proposed at home and abroad to perform accurate polarization calibration on the polarization spectrometer in the hemispherical field of view.

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