Abstract: HgCdTe detector was used to detect the interference spectra of CO₂ greenhouse gases on spaceborne greenhouse gas detection equipment. The performance of HgCdTe detector is significantly affected by operating temperature, and the detector needs to work at a constant low temperature. According to the operating temperature requirement, a temperature control system for spaceborne HgCdTe detector was designed. The system is mainly composed of temperature acquisition circuit, power-driven circuit and a main control unit based on FPGA. PID algorithm was adopted to realize precise temperature control. The experiment and application results show that the temperature control precision is better than 0.5℃, and the temperature stability is better than 0.1℃/s, which satisfies the on-orbit working temperature requirement of HgCdTe detector.

Key words: HgCdTe detector, temperature control, FPGA, PID algorithm