Semiconductor refrigerator closed-loop control method applied to space environment

Abstract

The invention relates to a semiconductor refrigerator closed-loop control method applied to a space environment and belongs to the spaceflight optical remote sensor technical field. The method includes the following steps that: a bridge type series circuit is adopted to acquire the current temperature V1 of the focal plane of a detector; the difference of a characterization parameter V1 of the current temperature of the focal plane of the detector and a characterization parameter V2 of the target temperature of the focal plane of the detector is obtained and amplified through an operational amplifier, and then is transmitted to a PID control circuit, so that control voltage can be obtained; and the control voltage outputted by the PID control circuit is transmitted to a driving circuit, and the driving circuit controls current passing through a semiconductor refrigerator, so that refrigeration can be performed for the focal plane of the detector. According to the closed-loop control circuit adopted by the method of the invention, bridge type series resistors are adopted to measure the temperature of the focal plane of the detector; at a temperature control point, the reaction of divided voltage to variation of the resistance value of a thermistor caused by temperature is most sensitive, wherein the resistance value at the temperature control point is selected, and therefore, measurement errors can be decreased, and high-precision measurement can be realized, and thus, high-precision control can be realized.

Description

technical field [0001] The invention relates to a closed-loop control method of a semiconductor refrigerator applied to a space environment, and belongs to the technical field of aerospace optical remote sensors. Background technique [0002] With the rapid development of aerospace optical remote sensor technology, the demand for detection wavelengths of optical remote sensors is becoming more and more diverse. In order to use different wavelengths to observe the observation target and reduce the restrictions on observation conditions, long-wavelength detectors are often used Observation of the target is realized. The signal-to-noise ratio of the detector is very sensitive to the influence of temperature. In order to improve the imaging quality of the long-wave observation detector, reduce noise and improve the signal-to-noise ratio, it is necessary to control the detector by refrigeration. According to the selection of the detector, the target temperature control point of ...

AI Technical Summary

Problems solved by technology

The system design is complex, bulky, costly, and there are high-order harmonics, which have an impact on the detector circuit

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