Research on high-precision temperature measurement and control technology for space mechanical cryogenic system

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.