A method for radiance calibration of large field of view optical remote sensing instrument

Abstract

The invention relates to a radiance calibration method of a large visual field optical remote sensing instrument. The radiance calibration method includes the following steps: the radial direction of a calibration system is changed by means of an external reflection unit, the radiation which has high-quality Burt characteristic in the calibration system radiation source is reflected to the visual field of the large visual field optical remote sensing instrument, and the full visual field radiance is calibrated. By means of the radiance calibration method of the large visual field optical remote sensing instrument, according to the multidirectional structural features of the large visual field, an external reflecting system of a circle structure composed of special plane mirrors is designed, a fixed angle is formed, the radiation with the high-quality Burt characteristic within an angle in a range of from a integrating sphere plus 30 degrees and the integrating sphere minus 30 degrees is reflexed to the direction meeting system calibration, therefore, the integrating sphere in not enlarged, the radiation with the high-quality Burt characteristic within the angle in the range of from the integrating sphere plus 30 degrees and the integrating sphere minus 30 degrees is fully used, and the radiance calibration of the large visual field optical remote sensing instrument is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical radiation calibration, in particular to a radiance calibration method for a large field of view optical remote sensing instrument that expands the application area of ​​an integrating sphere to perform radiance calibration. Background technique [0002] The radiometric calibration of remote sensing instruments can be attributed to two methods based on light sources and based on detectors. The integrating sphere is the most widely used radiation source in the radiation calibration of remote sensing instruments based on the light source method because of its large opening area and good uniformity. The integrating sphere is usually composed of a plurality of uniformly distributed light sources and a spherical shell coated with a uniform diffuse reflection coating inside. of Lambert. The principle of using the integrating sphere for radiance calibration is to establish a one-to-one correspondence be...

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Problems solved by technology

[0005] The present invention aims to solve the technical problem that the radiance calibration method in the prior art cannot carry out the calibration of the whole field of view of the system and cannot meet the detection needs. Field multi-directional detector, proposed a method to expand the application area of ​​the integrating sphere and establish a new radiation source for calibration, a method for radiance calibration of large field of view optical remote sensing instruments

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