Research on a Thermostatic Heating Control System for Optically Pumped Cesium Magnetometer

Since the operating temperature of absorption chamber affects the sensitivity of the optically pumped cesium magnetometer (OPCM) directly, it is necessary to control the temperature precisely. In this paper, by using the positive temperature coefficient (PTC) and the integral separation proportional-integral-derivative (PID) algorithm, a high-precision thermostatic heating system is designed for OPCM. Firstly, the PTC heating device and the TSic506 temperature sensor are used to form a closed loop control system. Then, the three parameters of P, I and D are adjusted for different temperature, and the temperature control system is realized by STM32 microcontroller. Finally, the integral separation PID algorithm is used to eliminate overshoot. Experiments show that the effective temperature control ranges are 45°C~55°C, the accuracy is less than ±0.2°C, and the system stability time is 300s. It is obviously that the designed system has reference value and guidance significance for OPCM.