Design of Temperature Control System of Photodetector Based on ADN8831

The performance parameters and long-term operation stability of the photodetector in radiation temperature measurement will change with the change of working temperature. In order to meet the high precision temperature control demand of the photodetector, a temperature control system based on the thermoelectric refrigeration control chip ADN8831 is designed. The control system uses the thermistor as the temperature sensing element, and uses the analog proportional integral differential (PID) circuit to control the temperature closed-loop. The experimental results show that the Thermoelectric cooler (TEC) inside the photodetector can stabilize at the set temperature within 11 s under the drive of the temperature control system, and the temperature control accuracy is as low as ± 0.01 °C.