Spaceborne fiber focal plane detector device

Abstract

Provided in the invention is a spaceborne fiber focal plane detector device comprising an entrance focal plane side, a scrambled fiber, a temperature control box, an optical fiber exit head, a collimating lens barrel, a collimating mirror, an attenuating sheet, a photomultiplier tube, a thermistor, a semiconductor refrigeration sheet, a heat tube, a heat-dissipating plate, a high-voltage power supply and a signal box, and a temperature control electronics box. The entrance focal plane side and the scrambled fiber are connected. The scrambled fiber passes through the temperature control box andis connected with the optical fiber exit head; the optical fiber exit head is inserted into the collimating lens barrel; the collimating mirror and the attenuating sheet are installed in the collimating lens barrel; the photomultiplier tube is installed at the rear end of the collimating lens barrel; the thermistor and the semiconductor refrigeration sheet are pasted to the housing of the photomultiplier tube; a cold end of the heat tube is pasted to the back of the semiconductor refrigeration sheet and a hot end is pasted to the inner side of the heat-dissipating plate; the high-voltage power supply is connected with the signal box and the photomultiplier tube; and the temperature control electronics box is connected with the thermistor and the semiconductor refrigeration sheet. Therefore, a problem of insufficient response capability of the detector of the satellite optical imaging load under the weak light condition is solved.

Description

technical field [0001] The invention relates to the field of low-brightness visible light imaging detectors, in particular to a spaceborne optical fiber focal plane detector device. Background technique [0002] The imaging effect of satellite optical payloads on the ground is limited by sunlight conditions. When the height of the sun relative to the object target is low in the morning and evening or under the moonlight at night, the brightness of the object object is low. At this time, the conventional optical load cannot image the ground. However, the imaging of the ground in the morning and evening areas and at night will greatly improve the detection coverage efficiency of the satellite. If the imaging of ground objects under low light conditions is realized, the detectors used by the optical payload are required to have extremely high detection sensitivity. [0003] Conventional visible light CCD and CMOS detectors are difficult to meet this requirement. The optical lo...

AI Technical Summary

Problems solved by technology

[0003] Conventional visible light CCD and CMOS detectors are difficult to meet this requirement. The optical load of conventional orbiting CCD and CMOS detectors generally requires a sun altitude angle greater than 30° to achieve a good signal-to-noise ratio, and the minimum detection radiance to the ground is about 10°. -5 W·cm -2 ·sr -1 magnitude

Although a single photomultiplier tube has photon-level detection sensitivity, it is not an optical focal plane structure, so it is difficult to be directly used in the optical path design of imaging optical loads

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