A high-precision temperature measurement and control method based on double feedback

Abstract

The invention relates to a high-precision temperature measurement and control method based on double feedback. The first step is temperature collection: the constant current drive temperature measurement part circuit provides constant current drive to the temperature sensor, and a dual feedback temperature measurement mechanism is designed to collect data, including main and auxiliary Feedback two temperature data; the second step, temperature measurement data conditioning: use two-stage amplification in a specific temperature zone to achieve the extraction and amplification of the temperature measurement diode junction voltage, and complete the two-stage amplification conditioning of the temperature measurement data; the third step, the analog Digital conversion and digital filtering; the fourth step, model identification; the fifth step, temperature control: design a parallel control switching scheme to select temperature measurement data, optimize temperature control algorithm and fixed-point processing of algorithm parameters, evaluate the real controlled temperature by the temperature control accuracy High-precision temperature control effect of the object. The double feedback of the present invention provides double reliability assurance of the feedback source of the temperature control system. In addition, the nearby digital scheme of the main feedback also improves the anti-interference ability of temperature measurement, and provides high-precision temperature measurement assistance for the high-precision temperature control effect.

Description

technical field [0001] The invention belongs to the technical field of temperature control of space optical remote sensors, in particular to a high-precision temperature measurement and control method based on double feedback. Background technique [0002] The temperature control accuracy and stability of the focal plane detector components in infrared remote sensing cameras directly affect the quality of camera imaging. With the increasing imaging quality requirements of optical remote sensing satellites, the requirements for detector temperature control technology are getting higher and higher. In the cold environment of deep space, the background noise received by the focal plane detector is very small, and the thermal radiation generated by the optical lens itself will become the main source of noise. The detector is maintained in a certain low temperature range with high precision, which can effectively improve the sensitivity of the detector. [0003] Commonly used re...

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Problems solved by technology

[0005] As far as the complexity of the temperature control system model is concerned, the design and analysis capabilities of the thermodynamic model are weak at present. Generally, the project experience and the designer's debugging experience are used to complete the temperature control debugging. This method takes a long time and costs a lot. , Lack of accuracy, not conducive to engineering operation

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