Natural water body sea surface polarization hyperspectral observation system

Abstract

The invention relates to a natural water body sea surface polarization hyperspectral observation system, and aims to realize in-situ observation of the natural water body polarization hyperspectral field, detect a polarization characteristic change rule of visible light in a natural water body radiation transmission process, and clarify an internal relation between water radiation polarization spectral characteristics and water color elements. According to the invention, three first hyperspectral radiance sensors, three second hyperspectral radiance sensors and a hyperspectral irradiance sensor are arranged on a rotary holder assembly; implementation of 360-degree comprehensive observation is achieved, meanwhile, linear polarizers are arranged at detection ports of the three first hyperspectral radiance sensors and the three second hyperspectral radiance sensors, so on-site in-situ observation at different altitude angles is achieved, irradiation and pollution of solar flare can be effectively avoided, interference of sky diffused light is restrained, the water leaving radiation polarization spectrum is accurately measured, and polarization spectrum measurement of different observation geometries of a natural water body is completed.

Description

technical field [0001] The invention relates to a spectrum observation device, in particular to a polarization hyperspectral observation system on the sea surface of a natural water body. Background technique [0002] Ocean water color remote sensing uses the total radiance information received by the water color satellite sensor at the top of the atmosphere, and obtains the radiance away from the water after atmospheric correction, and then retrieves the information of water color elements (such as surface phytoplankton chlorophyll, inorganic suspended matter, and yellow substances). At present, the mechanism, method and inversion model of ocean color remote sensing are becoming mature, and it is the only means to monitor the change of ocean environment on a global scale. However, more than 80% of the radiation received by the water color satellite sensor comes from atmospheric radiation and sea surface reflection, and the real water-leaving radiation only accounts for a sm...

AI Technical Summary

Problems solved by technology

[0004] However, in traditional remote sensing applications, polarization, which is an independent attribute of water-leaving radiation, is often ignored. In order to meet the 0.5% accurate radiometric calibration requirement of marine water color sensors (after replacing calibration), the polarization responsivity of water color sensors needs to be less than 2.5%, the polarization information of the water-leaving radiation is only used as noise correction or eliminated by setting a depolarizer

So far there is no ocean color satellite sensor that specifically detects the polarization characteristics of water-leaving radiation

In addition, due to the lack of underwater polarization spectroscopy instruments and many difficulties in the process of on-site polarization spectroscopy measurement, the accumulation of water polarization spectroscopy data is relatively small, and the research on the polarization characteristics of water-leaving radiation is less. The research on the influence of the ocean is still blank, which seriously restricts the progress of ocean water color polarization remote sensing.

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