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, and the method comprises the steps: 1, temperature collection: providing constant-current drive for a temperature sensor through a constant-current drive temperature measurement part circuit, and designing a double-feedback temperature measurement mechanism to collect data, including main and auxiliary feedback temperature data; 2, temperature measurement data conditioning: extracting and amplifying the junction voltage of a temperature measurement diode by adopting two-stage amplification of a specific temperature zone, and completing two-stage amplification conditioning of temperature measurement data; 3, carrying out analog-to-digital conversion and digital filtering; 4, identifying the model; and 5, temperature control: designing a parallel control switching scheme to select temperature measurement data, optimizing a temperature control algorithm and performing fixed-point processing on algorithm parameters, and evaluating a high-precision temperature control effect of a real controlled object according to temperature control precision. The dual feedback provides dual reliability guarantee for the feedback source of the temperature control system, in addition, the anti-interference capability of temperature measurement is also improved by the nearest digital scheme of the main feedback, and high-precision temperature measurement assistance is provided 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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