KEYWORDS: Temperature metrology, Temperature control, Infrared radiation, Infrared sensors, Cryocoolers, Control systems, Aerospace engineering, Thermal stability, Cryogenics, Spectral density
Space mechanical cryogenic systems are widely used in infrared optical remote sensing due to their large cooling capacity and wide cooling temperature range. They provide reliable cold sources for core components such as infrared detectors and other optoelectronic devices, ensuring the stable operation of infrared sensors. As the infrared remote sensing spatial resolution, radiation resolution and other indicators continue to improve, the platform resource requirements are becoming increasingly stringent. The high-precision temperature measurement and control technology under complex working conditions is gradually becoming the key technology of space mechanical cryogenic systems and is increasingly receiving attention. This paper analyzes the characteristics and related influencing factors of space mechanical refrigeration tasks, and achieves a high-precision temperature measurement and control of mK units by adopting high-stability constant current source, ultra-high precision temperature signal acquisition, and improved adaptive PID control algorithm, and gets in-orbit verification.
The time-modulated Fourier transform spectrometer completes spectral detection through the scanning mirror movement. To satisfy the t of low-speed and high-precision scanning, a linear quadratic optimal controller with minimum relative performance error is proposed. The ratio of the tracking error weighting factor Q and the energy consumption weighting factor R in the optimal controller is optimized by simulation, and when the ratio is 1:2, the speed instability of the scanning mirror in the uniform speed section is 2‰.
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