Optical path of multispectral polarization scanning radiometer based on reflecting telescope system

Abstract

The invention discloses an optical path of a multispectral polarization scanning radiometer based on a reflecting telescope system. The optical path comprises a pre-posed scanning mirror set, a telescope system and a main measuring optical path, wherein the pre-posed scanning mirror set is composed of a first planar mirror and a second planar mirror both which are orthogonal and installed on a remote sensing platform; the film layers of the first and second planar mirrors are silver reflection films respectively; the telescope system comprises a main mirror, a secondary mirror and a field diaphragm; the main mirror and the second mirror are concave parabolic mirrors and each plated with the a silver reflection film; the main measuring optical path comprises a polarizing component, multiple color separation filters, multiple reflector plates, multiple focusing lenses, multiple narrow band filters and multiple detectors. Because the reflecting telescope system is applied, the difference factors affecting the polarization measurement precision are reduced; the system is low in residual system polarization, wide in spectral range, flexible in amounts and positions of spectrums, high in transmittance, low in processing and installing precision and system cost.

Description

technical field [0001] The invention relates to the technical field of optical polarization measurement, is applicable to the polarization detection of atmospheric aerosol, and in particular relates to an optical path of a multispectral polarization scanning radiometer based on a reflection telescopic system. Background technique [0002] In the field of atmospheric remote sensing, polarization measurement is recognized as a key technology to describe the characteristics of aerosol particles. However, the use of polarization information in aerosol detection requires detection of polarization information as a function of angle and spectrum, that is, the polarization of scattered light, multi-spectral and multi-angle information must be combined to accurately obtain the optical thickness and microphysical properties of aerosols. [0003] The known aerosol detection polarization instruments are all designed with the ability to obtain multi-angle and multi-spectral polarization ...

AI Technical Summary

Problems solved by technology

One uses time-sharing measurement of polarization information, but the timing effect limits its polarization measurement accuracy, such as POLDER / PARASOL

The last category is to use split-aperture simultaneous polarization measurement method, which has high polarization measurement accuracy, such as RSP / APS. However, since the split-aperture adopts a multi-path parallel transmission telescopic system, the use of a large number of lenses increases the introduction of difference effects on the one hand. factors, including field of view difference, transmittance difference, installation stress difference, etc. of each spectral band, which affect the measurement accuracy and put forward strict requirements for processing and installation accuracy.

On the other hand, affected by the refractive material and the chromatic aberration of the transmission system, the number of spectral segments and the spectral range of each aperture are limited.

In addition, the use of crystal devices and binary detectors also increases the system cost and difficulty in installation and adjustment

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