| 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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| 引用本文： | 胡秀娟,李西京,王静,李细顺,畅国平,王秀敏,宋昭,罗娜,解真.仪器定向误差对地磁日变化记录 准确度的影响研究[J].地震学报,2016,38(1):130-137. |
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| 作者姓名： | 胡秀娟 李西京 王静 李细顺 畅国平 王秀敏 宋昭 罗娜 解真 |
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| 作者单位： | 1.中国河北邢台 054000 河北省地震局红山地磁台 |
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| 基金项目： | 河北省地震局三结合课题DZ20150424093中国地震局行业标准054219 |
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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1024.7 nT； 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.
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| 关 键 词： | 磁通门磁力仪GM4-2 定向 零场漂移S0 无磁旋转平台 |
| 收稿时间： | 2015-03-13 |
Influences of instrument orientation error on the accuracy of daily variation of geomagnetic record |
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| Institution: | 1.Hongshan Geomagnetic Observatory, Earthquake Administration of Hebei Province， Hebei Xingtai 054000， China2.Qianling Geomagnetic Observatory， Earthquake Administration of Shaanxi Province， Shaanxi Xianyang 712000， China |
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| Abstract: | Based on the daily variation of geomagnetic data recorded by fluxgate magnetometer GM4-2 at Hongshan geomagnetic observatory, this paper proposes a method for eliminating instrument orientation error, namely the correction method for magnetic axis zero drift S0 of D element. First, based on the mea-surement theory of magnetic axis zero drift S0, a rotation platform without magnetism has been trial-produced to measure the S0， which is about 1024.7 nT 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 magne-tic 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. |
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