A Calibration Optical System Based on Geosynchronous Orbit Differential Absorption Spectrometer

A geosynchronous orbit, differential absorption technology, applied in the field of optical measurement, can solve the problems of reduced reliability, heavy weight, and large optical system volume.

CN109374547BActive Publication Date: 2021-09-14HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-09-14

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Abstract

The invention discloses a calibration optical system based on a geosynchronous orbit differential absorption spectrometer. The swing mirror system consists of a pointing mirror, a swing sweep shaft system, a motor harmonic group, and a U-shaped bracket for the swing mirror. The front optical system is composed of a primary mirror, a secondary mirror, a third reflector, a plane reflector and a slit. The solar diffuse reflector assembly is composed of polytetrafluoroethylene diffuse reflector and corresponding structural parts. The solar shutter assembly includes a sun screen and a motor assembly. The calibration optical system uses the appropriate on-board calibration timing to introduce the bidirectional reflectance distribution function of extra-atmospheric solar illumination whose spectral irradiance is stable and known, so as to accurately measure the diffuse reflection plate and establish an approximate Lambertian surface with known spectral irradiance source, which provides a known radiative input to the remote sensor. The invention has high measurement accuracy, compact volume, light weight and high reliability.
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Description

technical field

[0001] The invention belongs to the field of optical measurement methods, specifically an optical system based on a geosynchronous orbit that collects and converges sunlight into a spaceborne differential absorption spectrometer for calibration. By introducing sunlight as a calibration light source, the work of the spectrometer is realized. Absolute radiometric calibration on the star with full optical path and full aperture, and long-term monitoring of the stability of the spectrometer on orbit. Background technique

[0002] The calibration optical systems of spaceborne and airborne differential absorption spectrometers commonly used at home and abroad basically use the combination of sunlight and diffuser plates. The solar radiation is used as the calibration radiation source to correct the radiation response change of the main optical path; the reference calibration device is used to correct the error caused by the self-decay of the working calibration pla...

Examples

Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] A calibration optical system based on a geosynchronous orbit differential absorption spectrometer, the calibration optical system includes an oscillating mirror system, a front optical system, a sunlight diffuse reflection plate assembly and a sunlight blocking door assembly; the oscillating mirror system includes a pointing mirror 1 , swing mirror swing sweep shaft system 2, motor harmonic group 3, swing mirror U-shaped bracket 4; wherein pointing mirror 1, swing sweep shaft system 2 and motor harmonic component 3 form a complete module, through the swing mirror U-shaped bracket 4. It is connected and fixed with the whole spectrometer, which can be disassembled and installed as a whole. The front optical system includes a primary mirror 5 , a secondary mirror 6 , a third reflective mirror 7 , a plane turning mirror 8 and a slit 9 . The...