Rapid absolute radiometric calibration method for push-broom dispersion type imaging spectrometer

Abstract

The invention discloses a rapid absolute radiometric calibration method for a push-broom dispersion type imaging spectrometer. According to the rapid absolute radiometric calibration method, a tungsten lamp and an xenon lamp are combined so as to be adopted as light sources, and the brightness ratio of the two kinds of light sources can be adjusted so as to obtain light sources with different spectral characteristics, and therefore, the defect of low brightness in shortwave bands when only the tungsten lamp is adopted as a light source can be eliminated; and in an acquisition process, the brightness ratio of the tungsten lamp and the xenon lamp can be adjusted for many times, which does not require precise control and only requires certain change of the brightness ratio to be ensured, and therefore, the adjustment can be completed in a short time period, and the responses of the imaging spectrometer are tested respectively, and a standard spectral radiometer is utilized to perform monitoring; the data acquisition mode can provide a plurality of groups of data with different spectral characteristics, and preferred data can be selected from the plurality of groups of data with different spectral characteristics when absolute radiometric calibration coefficients are calculated; and finally, when the absolute radiometric calibration coefficients are calculated, one group of data to which the imaging spectrometer highly respond is selected from experimental data, and therefore, calibration accuracy can be guaranteed, and the whole calculation process is completed by a computer, and therefore, calculation efficiency can be ensured.

Description

technical field [0001] The invention relates to the technical field of spectrometer calibration, in particular to a fast absolute radiation calibration method for a push-broom dispersion imaging spectrometer. Background technique [0002] Imaging spectroscopy technology is a new type of remote sensing technology that combines imaging technology and spectroscopy technology, which can simultaneously achieve the acquisition of spatial information and spectral information of the target. In recent years, imaging spectroscopy technology has become an important means of earth observation and deep space exploration, and various imaging spectroscopy systems that have emerged are widely used in agriculture, animal husbandry and forestry production, mineral resource exploration, marine remote sensing, military reconnaissance and other fields. [0003] Push-broom dispersive imaging spectrometer is a relatively common imaging spectroscopy system. Its principle is simple, its performance ...

AI Technical Summary

Problems solved by technology

However, the tungsten lamp used in this method has low radiance in the short-wave band, and in order to prevent long-wave overexposure from damaging the detector, the overall brightness of the light source cannot be increased infinitely, which makes it difficult for the calibration light source in the short-wave band to reach a higher brightness level , the calibration accuracy will be difficult to guarantee

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