Precise temperature control system of satellite-borne detector

Abstract

The invention discloses a precise temperature control system. The system comprises a detector assembly. The detector assembly comprises a refrigeration frame used for installing an infrared detector body, and the outer end of the refrigeration frame is connected with a heat sink copper block. The detector assembly is connected with one end of the heat pipe through the heat sink copper block, and the other end of the heat pipe is connected with the radiation cold plate. According to the system, refrigeration is realized by adopting a combined mode of the radiation cold plate and the thermoelectric refrigerator. The thermoelectric refrigerator adopts a direct-current driving mode, so that the photosensitive surface of the detector is ensured to have higher temperature stability, and meanwhile, noise interference caused by a refrigeration driving circuit is avoided. The system can ensure that the photosensitive surface of the detector works at a lower temperature, has higher temperature stability, and meets the application requirements of infrared band high-precision weak signal measurement. In addition, the system is compact in structure, simple in process, easy to implement and highin reliability.

Description

technical field [0001] The invention relates to a temperature control system, in particular to a precise temperature control system of a spaceborne detector. Background technique [0002] Polarization detection in the short-wave infrared band has been widely used in cloud aerosol particle state detection, surface polarization reflectance detection, and environmental monitoring and other fields. As the core component of short-wave infrared polarization information acquisition, the infrared detector is responsible for the measurement of infrared spectrum and polarization information. Detector thermal noise, dark current and temperature drift directly affect the application performance of infrared detectors, especially in applications where the detection signal is extremely weak, dark current and temperature drift are one of the important factors affecting the measurement accuracy of infrared detectors. Among them, the fluctuation of dark current will be introduced into the in...

AI Technical Summary

Problems solved by technology

[0003] At present, the temperature control system of the detector used in orbit can achieve a lower temperature control target, but it is difficult to achieve a higher temperature control accuracy. For some weak light radiation measurement applications, the photocurrent signal is on the order of tens of pA , there are high requirements for the level of dark current and its fluctuation with temperature, and the short-term temperature stability should be better than ±0.05℃ / s

Some commercial-grade detector temperature control systems can achieve lower refrigeration temperature and higher temperature stability, but it is difficult to meet space application requirements in terms of resource consumption and application reliability.

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