Power up-off control system of refrigeration infrared detector

Abstract

A power up-off control system of a refrigeration infrared detector comprises a command transmission link module, a temperature collection module, a filed programmable gate array (FPGA) power up-off control module, a refrigerator and a relay. According to the command transmission link module, power up-off commands are output through an open collector (OC) door transmission end, transmitted through a three-wire transport protocol, received by an optical coupling isolator and then sent to the FPGA power up-off control module. According to the temperature collection module, three independent temperature measuring circuits are utilized to measure the temperature of a focal plane of the detector, a selector gates temperature measuring results of the three temperature circuits in a time-division mode, and average deviation (AD) is input for quantification. The FPGA power up-off control module receives the power up-off control command and the temperature measurement results after the AD quantification. If the power-up command is received, the refrigerator is powered on to refrigerate the focal plane of the detector, and meanwhile the AD quantification results are compared with a temperature threshold. When at least two quantification results are lower than the temperature threshold, the relay is turned on to power up the detector. If the power-off command is received, the relay is turned off to achieve the power interruption of the detector.

Description

technical field [0001] The invention relates to a system for controlling power on and off of a refrigeration infrared detector for remote sensing. Background technique [0002] When the refrigerated infrared detector is applied, the refrigerator needs to keep the focal plane of the detector at a low temperature. Only when the temperature reaches the specified threshold, can it be powered on and start working according to the command, otherwise it may cause permanent damage to the detector. When infrared detectors are used for space remote sensing, the control circuit needs to have effective measures to mitigate the impact of single particles. Therefore, a highly reliable infrared detector plus power-off control system is the key to the safe use of the detector. [0003] The existing refrigerated infrared imaging circuit consists of figure 1 As shown, the remote control telemetry unit is responsible for communicating with the 1553B bus of the whole star, executing relevant c...

AI Technical Summary

Problems solved by technology

[0006] 3. A single-channel temperature measurement circuit is used to measure the temperature of the focal surface. If the temperature measurement circuit fails, the power-on and power-off control of the detector cannot be realized;

[0007] 4. The accuracy and reliability of the temperature comparator have a decisive influence on the power on and off. If there is interference, the detector may be powered on by mistake

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