Radiation calibration method of all-sky imager based on stellar radiation spectrum and flux

Abstract

The embodiment of the invention discloses a radiation calibration method for an all-sky imager based on stellar radiation spectrum and flux. The radiation calibration method includes: after selecting the target star in the all-sky image, determining the zenith angle corresponding to the target star at the moment of the all-sky image at the aurora observation station, and obtaining the target star on the aurora observation spectrum line according to the zenith angle The atmospheric transmittance at the corresponding zenith angle; the photon radiation flux of the target star on the auroral observation spectrum line and the first solid angle corresponding to the target star are calculated, and the target star is determined according to the photon radiation flux and the first solid angle The stellar radiance of the target star is determined; the detector output signal value corresponding to the target star is determined, and the radiation coefficient of the all-sky imager is determined according to the detector output signal value, atmospheric transmittance and stellar radiance. The technical solution of the embodiment of the present invention is to achieve rapid and accurate radiometric calibration of the all-sky imager regardless of geographical limitations, and the radiometric calibration of the all-sky imager is more flexible.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of radiation calibration, and in particular, to a radiation calibration method for an all-sky imager based on stellar radiation spectrum and flux. Background technique [0002] The all-sky imager is an important ground-based optical observation equipment for the space environment. The radiation parameter calibration of the all-sky imager can obtain the real excitation intensity of the auroral structure in the all-sky image on different observation spectrum lines. The premise of the aurora excitation intensity in the observation equipment data is also the basis for the quantitative study of related physical processes and mechanisms. [0003] Before the all-sky imager leaves the factory, the radiation parameters of "radiation intensity-image value" of the all-sky imager are mainly calibrated through laboratory calibration experiments. During the long-term use of the all-sky imager, due to...

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Problems solved by technology

At present, the radiation calibration of the all-sky imager is carried out in the optical laboratory, and the calibration sources used are artificial radiation sources such as integrating spheres, tungsten lamps, and Lambertian planes. As far as the all-sky auroral imager in the region) is concerned, it is very difficult to recalibrate in the laboratory due to the limitation of the site conditions

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