仪器定向误差对地磁日变化记录准确度的影响研究
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摘要
基于红山地磁台磁通门磁力仪GM4-2记录的日变化数据,提出了一种减小仪器定向误差的方法,即D要素磁轴零场漂移S0校正法.首先基于零场漂移S0测量原理,试制测量工具无磁旋转平台,并对磁力仪GM4-2零场漂移S0值进行测量,得出该值约为1 024.7nT;然后在重新定向时对该数值进行误差校正;最后将较正后的零场漂移S0值应用到理论日变化数据和定向后的实际日变化数据中.结果表明,D要素磁轴零场漂移S0是产生定向误差的主要因素,经过零场漂移S0校正后的日变化数据与理论日变化数据一致,消除了由定向误差所造成的日变化畸变,从而能更真实地反映地磁场变化.
Based on the daily variation of geomagnetic data recorded by fluxgate magnetometer GM4-2at Hongshan geomagnetic observatory,this paper proposes a method for eliminating instrument orientation error,namely the correction method for magnetic axis zero drift S0 of Delement.First,based on the measurement theory of magnetic axis zero drift S0,a rotation platform without magnetism has been trial-produced to measure the S0,which is about 1 024.7nT for the GM4-2.Then,we correct the error of S0 value in reorientation.Finally,the S0 value is applied to both theoretical daily variation and daily variation recorded by the instrument after orientation.The results show that the magnetic axis zero drift S0 of D element is the main factor for the orientation error.The daily variation recorded by the instrument after orientation are consistent with the theoretical daily variation,thus eliminating the daily variation distortion caused by the orientation error,and reflecting the geomagnetic filed variation more realistically.
Based on the daily variation of geomagnetic data recorded by fluxgate magnetometer GM4-2at Hongshan geomagnetic observatory,this paper proposes a method for eliminating instrument orientation error,namely the correction method for magnetic axis zero drift S0 of Delement.First,based on the measurement theory of magnetic axis zero drift S0,a rotation platform without magnetism has been trial-produced to measure the S0,which is about 1 024.7nT for the GM4-2.Then,we correct the error of S0 value in reorientation.Finally,the S0 value is applied to both theoretical daily variation and daily variation recorded by the instrument after orientation.The results show that the magnetic axis zero drift S0 of D element is the main factor for the orientation error.The daily variation recorded by the instrument after orientation are consistent with the theoretical daily variation,thus eliminating the daily variation distortion caused by the orientation error,and reflecting the geomagnetic filed variation more realistically.
引文
陈化然,杜爱民,王亚丽,杨冬梅,张素琴,李琪,赵旭东,刘晓灿,朱荣,何宇飞,马君钊,王建国.2009.地磁低点位移与地磁场等效电流体系关系的初步研究[J].地震学报,31(1):59--67.Chen H R,Du A M,Wang Y L,Yang D M,Zhang S Q,Li Q,Zhao X D,Liu X C,Zhu R,Hu Y F,Ma J Z,Wang J G.2009.A preliminary study on the relation between the geomagnetic“lowest shift”phenomenon and the equivalent current system[J].Acta Seismologica Sinica,31(1):59--67(in Chinese).
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胡秀娟,李细顺,王利兵,王静,畅国平,王秀敏,梁斌.2014a.红山台磁通门磁力仪观测数据对比分析[J].华北地震科学,32(2):68--72.Hu X J,Li X S,Wang L B,Wang J,Chang G P,Wang X M,Liang B.2014a.Contrastive analysis of fluxgate magnetometer observation at Hongshan seismis station[J].North China Earthquake Sciences,32(2):68--72(in Chinese).
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王晓美,腾云田,王喜珍,王晨,吴琼.2008.GM4型磁通门磁力仪性能检验方法[J].地震地磁观测与研究,29(6):88--94.Wang X M,Teng Y T,Wang X Z,Wang C,Wu Q.2008.The test method for the performance of fluxgate magnetometer[J].Seismological and Geomagnetic Observation and Research,29(6):88--94(in Chinese).
张素琴,杨冬梅.2011.地磁日变化记录准确度标定结果分析[J].地震地磁观测与研究,32(5):60--65.Zhang S Q,Yang D M.2011.Study on the stability and accuracy of baseline values measured during the calibrating time[J].Seismological and Geomagnetic Observation and Research,32(5):60--65(in Chinese).
朱兆才.2004.三分量磁通门磁变仪探头正交误差对定向的影响[J].东北地震研究,20(2):70--75.Zhu Z C.2004.Effects on the right-angled error of the three-component flux gate magnetometer exploring head to the sense of orientation[J].Seismological Research of Northeast China,20(2):70--75(in Chinese).
程安龙.1993.关于基线值拟合问题的讨论[J].地震地磁观测与研究,14(2):54--57.Cheng A L.1993.The discussion about curve fit base-line values[J].Seismological and Geomagnetic Observation and Research,14(2):54--57(in Chinese).
高玉芬,程安龙,赵永芬,周锦屏.1991.地磁台基线值分析[J].地震地磁观测与研究,12(2):3--10.Gao Y F,Cheng A L,Zhao Y F,Zhou J P.1991.Baseline analysis for geomagnetic observatory[J].Seismological and Geomagnetic Observation and Research,12(2):3--10(in Chinese).
胡秀娟,李细顺,王利兵,王静,畅国平,王秀敏,梁斌.2014a.红山台磁通门磁力仪观测数据对比分析[J].华北地震科学,32(2):68--72.Hu X J,Li X S,Wang L B,Wang J,Chang G P,Wang X M,Liang B.2014a.Contrastive analysis of fluxgate magnetometer observation at Hongshan seismis station[J].North China Earthquake Sciences,32(2):68--72(in Chinese).
胡秀娟,杨冬梅,王静,李细顺,畅国平,王利兵,王秀敏,张素琴,舒雷.2014b.磁通门磁力仪GM4定向方法的研究[J].震灾防御技术,9(增刊):609--614.Hu X J,Yang D M,Wang J,Li X S,Chang G P,Wang L B,Wang X M,Zhang S Q,Shu L.2014b.Research on the orientation method using fluxgate magnetometer[J].Technology for Earthquake Disaster Prevention,9(Suppl):609--614(in Chinese).
王晓美,腾云田,王喜珍,王晨,吴琼.2008.GM4型磁通门磁力仪性能检验方法[J].地震地磁观测与研究,29(6):88--94.Wang X M,Teng Y T,Wang X Z,Wang C,Wu Q.2008.The test method for the performance of fluxgate magnetometer[J].Seismological and Geomagnetic Observation and Research,29(6):88--94(in Chinese).
张素琴,杨冬梅.2011.地磁日变化记录准确度标定结果分析[J].地震地磁观测与研究,32(5):60--65.Zhang S Q,Yang D M.2011.Study on the stability and accuracy of baseline values measured during the calibrating time[J].Seismological and Geomagnetic Observation and Research,32(5):60--65(in Chinese).
朱兆才.2004.三分量磁通门磁变仪探头正交误差对定向的影响[J].东北地震研究,20(2):70--75.Zhu Z C.2004.Effects on the right-angled error of the three-component flux gate magnetometer exploring head to the sense of orientation[J].Seismological Research of Northeast China,20(2):70--75(in Chinese).