Digital Temperature Control Design of Hydrogen Maser

The purpose of this design is to realize the digital temperature control of the hydrogen maser. Based on the basic principle of temperature detection and control design of a two-stage temperature control system (including the hydrogen maser inside the furnace and the furnace), the temperature control system is mainly composed of bridge circuit, analog-to-digital conversion circuit, temperature calculation and PID (proportional integral differential) control system, PWM (pulse width modulation) output circuit, heating wire. When the ambient temperature fluctuates from 21℃ to 25℃, the digital temperature control system achieves the temperature stability of 0.002℃, which proves the feasibility of using the digital board to control the temperature of the hydrogen maser.