磁通门磁力仪探头定向角度与准确度标定分析  

The preliminary analysis of directional angle and measurement accuracy on fluxgate magnetometer probe

作　　者：张敏[1] 杨福喜[1] 张文来[1] 许秋龙[1] 刘贤伦[1] 王喜珍[2,3] 

机构地区：[1]新疆维吾尔自治区地震局,中国乌鲁木齐830011 [2]中国地震局地球物理研究所,中国北京100081 [3]中国科学院空间天气学国家重点实验室,中国北京100190

出　　处：《地震地磁观测与研究》2015年第6期102-108,共7页Seismological and Geomagnetic Observation and Research

基　　金：新疆地震科学基金"地磁台站磁通门磁力仪探头定向角度与测量准确度关系的试验与研究"(201204);国家重点实验室专项基金资助项目(Y32612A24S1);新疆地磁场磁暴分布特征及日变化异常与地震的关系(201413)联合资助

摘　　要：乌鲁木齐地震台迁往呼图壁,采用传统方法对地磁仪进行安装调试,对探头不同定向角度下日变化进行准确度标定,每个角度观测一天,持续9小时。因对仪器系统零场漂移值估计不足,探头定向角度范围偏小,建议取值范围±500 nT(约±1°),受绝对观测精度及磁通门磁力仪影响因素的制约,取100 nT作为步长较好。实验认为,定向角度与日变化准确度标定精度无明显统计关系,认为影响磁通门磁力仪数据质量的主要因素是人为影响和仪器自身零场漂移过大。Using the opportunity of Urumqi geomagnetic instrument moved to Hutubi Seismic Station, all geomagnetic instruments are tested using the traditional method as installation. After the instruments are stable, daily variation accuracy is calibrated using different directional angle. The observation for each angle lasts about nine hours in one day. There is something weaknesses in the experiments, we do not consider the zero drift value too much, and the step value of our experiment may be small, so we suggest stations need to apply such experiments to get the orientation angle, the appropriate values range is ±500 n T（about ±1°）. Restricted by the absolute accuracy and other factors of magnetometer, using 50 nT or much smaller step in directional experiment cannot improve the experimental results significantly. Taking 100 nT as step value for experiment is a better choice. There is no significant statistic relationship between the accuracy of Calibration precision experiment and directional angle. It is found that the main influence factors of flux-gate magnetometer data quality are human disturbance and the too large zone drift of instrument.

关 键 词：反馈地震计 宽频带 数字反馈 长周期噪声 

分 类 号：P315.721[天文地球—地震学] P318.61[天文地球—固体地球物理学]