Field radiation calibration and calibrator for large-bore photoelectric system

Abstract

The invention relates to a scaling method and the device of the large-bore photoelectric radiationdetector used in the field experiment. The method is that the output of the radiation scaling light source is smaller than the entrance pupil of the scaling optoelectronic system and the angle of divergence is bigger than the field angle of the scaling optoelectronic; the standard radiation resource scales to get the responsibility according to the reference radiometer; the reference radiometer scales to get the emergent radiation brightness according to the radiation scaling light source; the radiation scaling light source lights the scaled photoelectricity system to form the facula which is bigger than the detector area in the image surface to get the image number output and the irradiance responsibility. The device includes the detector, the chopper, the two clear apertures, the two primary mirrors, the two secondary mirrors, the two drawtubes, the light column, the cavity radiation resource and the linker; the small radiation scaling light source can reach the efficient of the big one; so it has the low weight, the low energy cost, the simple operation, the uniform image surface and the big radiation energy field.

Description

technical field [0001] The invention belongs to the technical field of photoelectric radiation measurement, and relates to a radiation calibration method and device for a large-diameter photoelectric radiation measurement system used in field experiments. technical background [0002] The task of the photoelectric radiation measurement system (hereinafter referred to as the photoelectric system) is to measure the amount of radiation emitted by the target, and the actual output of the measurement system is an electrical signal, which is related to the amount of radiation emitted by the target. The purpose of radiation calibration is to determine the relationship between the amount of incident radiation and the output electrical signal. The main principle of radiation calibration is to place a radiation source of known radiation value (retrievable to the national measurement standard) before the optical entrance pupil of the photoelectric system to be calibrated, and according...

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Problems solved by technology

Therefore, this method is suitable for radiometric calibration of photoelectric systems measuring dim targets or small dynamic ranges, and for A P / A S ≥6000 photoelectric system, due to the serious attenuation of radiation energy incident on the image surface, it cannot meet the radiation calibration requirements of its large dynamic range

In our specific embodiment, the radiation calibration requires the use of an infrared cavity-type radiation source. Due to on-site power consumption and current technology and process limitations, this radiation source can only achieve a stable working temperature of up to 1500K, with an open exit pupil The diameter of the calibration photoelectric system is 8mm, and the diameter of the entrance pupil of the calibration photoelectric system reaches 670mm, which makes the energy incident on the image surface attenuated by more than 7000 times, which is very weak. Therefore, the problem brought about by this calibration method is that it introduces Larger calibration error, on the other hand, can only be calibrated in a small dynamic range, which cannot meet the calibration requirements, so this method is not applicable

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