关键词: 光泵磁力仪, 无磁加热, 现场可编程门阵列

Abstract: Aiming at the requirement of high temperature stability and non-magnetic interference in the atomic gas cell of the cesium optical-pumping magnetometer,a non-magnetic thermostat control system for the cesium optical-pumping magnetometer is designed.The system mainly includes a non-magnetic heating chip and a non-magnetic thermostat control circuit.The non-magnetic heating chip adopts the double-layer symmetrical four-wire structure of MEMS technology,which can effectively suppress the magnetic field generated by the current;The non-magnetic thermostat control circuit uses AC heating to further reduce the constant magnetic field interference.With the field programmable gate array as the core,the direct digital frequency synthesis technology is used to generate high-frequency heating signals,and then the non-magnetic thermostat control is performed through power amplification to reduce the circuit hardware resource.The test results show that the temperature control stability of the gas cell can reach 0.02 ℃,which meets the performance requirements of the optical-pumping magnetometer.

Key words: Optical-pumping magnetometer, Non-magnetic heating, Field Programmable Gate Array (FPGA)