On-board calibration method of laser light source and imaging spectrometer

Abstract

The application discloses a laser light source and an imaging spectrometer on-board calibration method, wherein the laser light source includes: a laser, an optical fiber, a collimator lens group, a first reflector, a motor, an integrating sphere, a collimation system, and a second reflector and diffuse reflection plate; the laser light source can provide collimated laser light for the space cryoradiometer and the transfer radiometer, so as to realize the calibration of the transfer radiometer by the space cryoradiometer; in addition, the laser source can also provide the transfer radiometer and imaging The spectrometer provides a monochromatic surface light source with uniform radiance to realize the on-board calibration of the imaging spectrometer using the transfer radiometer. Since the laser light source does not contain ultraviolet components, it will not decompose the chemical components on the surface of the diffuse reflection plate, thereby avoiding errors in the on-star calibration of the imaging spectrometer due to changes in the two-way reflectivity of the diffuse reflection plate. Further, the wavelength calibration precision of the monochromatic light source is high, which improves the calibration precision of the imaging spectrometer.

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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