一种宽工作温度范围的高灵敏度铯原子磁传感器

A high sensitivity cesium atomic magnetometer with a wide operating temperature range

针对航空平台磁异常探测应用需求,研制了一种宽工作温度范围的高灵敏度铯原子磁传感器,解决了现有传感器存在的工作温度范围小、低温下易磁场失锁等问题。利用温度反馈机制对铯原子灯激发源进行实时补偿,提高了原子磁传感器的稳定性和工作温度范围,铯原子灯输出光功率稳定性由2.10(标准差)提升至0.62,传感器工作温度范围由-20℃~60℃提升至-50℃~70℃。基于低噪声铯原子灯和窄线宽铯原子吸收室技术,该文开展了铯原子磁传感器整机设计与参数优化,研制出高灵敏度铯原子磁传感器样机。测试结果表明,在常温及地磁背景下的实际测量灵敏度达 140 fT/√Hz@1 Hz,指标优于同类国际先进水平产品G-824A型铯原子磁传感器。

A high sensitivity cesium atomic magnetometer with wide temperature characteristics is developed to meet the magnetic anomaly detection application requirements on an airborne platform.The problems of existing sensors such as small operating temperature range and easy magnetic field lock-out at low temperature.The temperature feedback mechanism is utilized to compensate the excitation source of the cesium atomic lamp in real time,and the atomic magnetic sensor′s stability and working temperature range is improved.The stability of the output optical power of cesium atomic lamp is increased from 2.10(standard deviation)to 0.62,and the operating temperature range of the sensor is increased from-20℃~60℃to-50℃~70℃.The design and parameter optimization of cesium atomic magnetic sensor are presented,which are based on low-noise cesium atomic lamp and a cesium vapor cell with a narrow bandwidth.A prototype of high sensitivity cesium atomic magnetometer is developed.Test results show that the cesium atomic magnetometer prototype′s measured sensitivity in the geomagnetic background is around 140 fT/√Hz@1 Hz,which is better than that of comparable worldwide commercial items(Geometrics G-824A cesium atomic magnetometer).