A Polarized Hyperspectral Observation System for Natural Water Surface

Abstract

The present invention relates to a polarization hyperspectral observation system of natural water body and sea surface. The purpose is to realize in-situ observation of polarization hyperspectrum of natural water body, to detect the change law of polarization characteristics of visible light in the process of radiation transmission of natural water body, and to clarify the characteristics of ionized water radiation polarization spectrum and Intrinsic relationship between water color elements. In the present invention, three first hyperspectral radiance sensors, three second hyperspectral irradiance sensors and one hyperspectral irradiance sensor are arranged on the rotating pan-tilt assembly to realize 360-degree comprehensive observation, and at the same time, three hyperspectral irradiance sensors A linear polarizer is set at the detection ports of one hyperspectral radiance sensor and three second hyperspectral radiance sensors to realize on-site observation at different altitude angles, which can effectively avoid the sun's glare and pollution, and suppress sky diffuse. It can accurately measure the polarization spectrum of water-leaving radiation, and complete the polarization spectrum measurement of different observation geometries of natural water bodies.

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.

Images