Imaging spectrometer absolute radiation calibration method

Abstract

The invention discloses an imaging spectrometer absolute radiation calibration method and belongs to the field of optical metrological testing. The method utilizes a high-stability radiation source combination imaging system, a beam-splitting system and an integrating sphere to generate uniform monocolor radiation through a heavy-caliber parallel collimator to form collimated radiation to be received by a standard radiometer with a precise diaphragm and a measured imaging spectrometer, spectral radiant luminance on an entrance pupil face of the measured imaging spectrometer is calibrated by the standard radiometer, and full wavelength absolute radiation calibration of the imaging spectrometer can be realized. The imaging spectrometer absolute radiation calibration method solves the problem of absolute radiation calibration of current imaging spectrometers, measuring of responsivity uniformity of the imaging spectrometer can also be realized, and the imaging spectrometer absolute radiation calibration method has the advantages of high calibration accuracy and wide application prospect.

Description

technical field [0001] The invention belongs to the field of optical metrology and testing, and relates to a method for absolute radiation calibration, in particular to a method for high-accuracy absolute radiation calibration of an imaging spectrometer. Background technique [0002] Imaging spectrometers include various multi-spectral and hyperspectral imaging spectrometers from near-ultraviolet to far-infrared, which are used to detect, identify and distinguish targets and backgrounds. Imaging spectrometers have the ability to obtain detailed spectral images of earth targets and fast global coverage, and are widely used in satellite remote sensing, space exploration and other fields. In addition, because full-color images are difficult to distinguish between camouflage and false targets, the use of imaging spectrometers can successfully detect targets from camouflaged objects through the detection of different spectral characteristics of targets and camouflage materials, a...

AI Technical Summary

Problems solved by technology

The domestic absolute radiometric calibration adopts the method based on the spectral irradiance lamp. This method is to use the spectral irradiance standard lamp to irradiate a standard whiteboard at a certain distance to obtain a standard radiance source, which is used to calibrate the small field of view spectroradiometer, and then Use this spectroradiometer to calibrate the spectral radiance or spectral irradiance of a large-area uniform radiance source (integrating sphere light source), and then use the integrating sphere light source to calibrate the spectral radiance responsivity or spectral irradiance responsivity of the imaging spectrometer, In order to achieve absolute radiometric calibration, the transmission chain of radiometric calibration using this method is too long, so the calibration uncertainty is relatively high

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