Method for calibrating laser light sources and imaging spectrometers in on-orbit manner

Abstract

The invention discloses a method for calibrating laser light sources and imaging spectrometers in an on-orbit manner. Each laser light source comprises a laser device, an optical fiber, a collimating lens assembly, a first reflecting mirror, a motor, an integrating sphere, a collimating system, a second reflecting mirror and a diffuse reflector. The method has the advantages that collimated laser light can be provided by the laser light sources for space low-temperature radiometers and transmission radiometers, and accordingly the transmission radiometers can be calibrated by the aid of the space low-temperature radiometers; monochromatic surface light sources with uniform radiant brightness further can be provided by the laser light sources for the transmission radiometers and the imaging spectrometers, so that the imaging spectrometers can be calibrated in the on-orbit manner by the aid of transmission radiometers; the laser light sources do not contain ultraviolet components, accordingly, chemical compositions of the surfaces of the diffuse reflectors can be prevented from being decomposed, and on-orbit calibration errors of the imaging spectrometers due to change of bidirectional reflectivity of the diffuse reflectors can be prevented; the monochromatic light sources are high in wavelength calibration precision, and accordingly the calibration precision of the imaging spectrometers can be improved.

Description

technical field [0001] The present application relates to the technical field of on-board calibration of imaging spectrometers, and more specifically, relates to a laser light source and an on-board calibration method of imaging spectrometers. Background technique [0002] With the development of scientific research, especially in the field of national economy, research on crop yield estimation, mineral exploration, resource survey, environmental monitoring and other issues requires high-precision hyperspectral remote sensing data. Hyperspectral Remote Sensing (HyperspectralRemoteSensing), the full name of hyperspectral resolution remote sensing, refers to the continuous remote sensing imaging of ground objects with a narrow and continuous spectral channel. The most important imaging device is the imaging spectrometer, so the imaging spectrometer On-board calibration accuracy greatly affects the imaging effect of hyperspectral remote sensing. [0003] In the prior art, the ...

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a laser light source and an imaging spectrometer on-board calibration method to solve the problems caused by the ultraviolet components in the sunlight decomposing the chemical composition and bandwidth of the surface of the diffuse reflection plate and the calibration error of the center wavelength. Problems causing on-board calibration errors of the imaging spectrometer

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