低漂移地磁相对观测磁通门磁力仪

Low drift relative geomagnetic observation fluxgate magnetometer

针对地磁相对观测工作存在的时间及幅值漂移等问题,进行时间一致性、幅值低漂移以及网络通讯等关键技术研究,开发了由低漂移磁通门传感器和低漂移数据采集电路组成的地磁相对观测仪器,将研制的3台仪器与昌黎后土桥地震台现有GM4磁通门磁力仪进行对比测试,并对测试数据进行日形态变化和预处理分钟值等分析,结果表明,3台待测仪器30天内漂移小于1个采样点,日变化曲线一致性强,与GM4数据曲线最大偏差小于0.7 nT,满足地震台站相对记录设备技术指标的要求。

Aiming at the time and amplitude drift of relative geomagnetic observation,the key techniques such as time consistency,low amplitude drift and network communication were studied,and low drift fluxgate sensors and low drift data acquisition circuits were developed.The three instruments developed were compared with the existing GM4 fluxgate magnetometer at the seismic station.The test data was compared and analyzed in terms of daily morphological changes and pre-processing minute values.The results show that the drift of three magnetometers to be tested less than 1 sampling point within 30 days.The daily variation curve is consistent and the maximum deviation from the GM4 data curve is less than 0.7 nT,which meets the requirements of the seismic station’s relative recording equipment technical specifications.