A spaceborne optical fiber focal plane detector device

Abstract

A space-borne optical fiber focal plane detector device, comprising: incident focal plane end, mode-scrambling optical fiber, temperature control box, optical fiber output head, collimating lens barrel, collimating mirror, attenuation sheet, photomultiplier tube, thermistor , semiconductor refrigeration sheet, heat pipe, heat sink, high-voltage power supply and signal box, temperature control electronics box; the incident focal plane is connected to the mode-scrambling optical fiber; the mode-scrambling optical fiber passes through the temperature control box and is connected to the optical fiber output head; the optical fiber output head is inserted Collimator tube; collimator mirror and attenuator are installed in the collimator tube; photomultiplier tube is installed at the rear end of the collimator tube; On the back of the semiconductor cooling sheet, the hot end is pasted on the inside of the cooling plate; the high voltage power supply is connected to the signal box and the photomultiplier tube; the temperature control electronics box is connected to the thermistor and the semiconductor cooling sheet. The invention solves the problem of insufficient response capability of the detector of the satellite optical imaging load under weak light conditions.

Description

technical field [0001] The invention relates to the field of low-brightness visible light imaging detectors, in particular to a space-borne optical fiber focal plane detector device. Background technique [0002] The imaging effect of satellite optical payloads on the ground is limited by the sun's illumination conditions. When the sun has a low altitude angle relative to the ground object in the morning and twilight area or under the moonlight at night, the brightness of the ground object is low. At this time, the conventional optical load cannot image the ground. However, imaging the ground in the morning and evening areas and at night will greatly improve the detection coverage efficiency of satellites. To achieve ground object imaging under low-light conditions, the detectors used for optical payloads are required to have extremely high detection sensitivity. [0003] Conventional visible light CCD and CMOS detectors are difficult to meet this requirement. The optical l...

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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