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地震 ›› 2003, Vol. 23 ›› Issue (4): 97-103.

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FHD 磁力仪分量线圈装置误差对磁偏角观测的影响分析

冯志生, 夏忠, 梅卫萍, 张秀霞, 庄明龙, 沈红会, 张晓勇   

  1. 江苏省地震局, 江苏南京 210014
  • 收稿日期:2003-01-07 修回日期:2003-03-13 出版日期:2003-10-31 发布日期:2021-12-21
  • 作者简介:冯志生( 1961-), 男, 江苏海安人, 副研究员, 1987 获硕士学位, 主要从事震磁及前兆台网观测等研究。
  • 基金资助:
    “ 十五” 国家科技攻关项目( 200104BA601B01-04-02)

Study on the influence of the directional error of the vector coil on the declination of FHD vector proton precession magnetometer

FENG Zhi-sheng, XIA Chong, MEI Wei-ping, ZHANG Xiu-xia, ZHUANG Ming-long, SHEN Hong-hui, ZHANG Xiao-yong   

  1. Seismological Bureau of Jiangsu Province, Nanjing 210014, China
  • Received:2003-01-07 Revised:2003-03-13 Online:2003-10-31 Published:2021-12-21

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摘要： 根据FHD 磁力仪观测磁偏角的原理, 计算了分量线圈不水平导致的磁偏角观测值误差,发现分量线圈仅在EW 方向的倾斜对磁偏角观测产生误差。文中将理论分析结果与实际观测结果进行了对比分析, 发现由于分量线圈底座水平的长期漂移, 仪器的垂直分量及磁偏角观测误差也会发生长期漂移, 长期漂移变化的周期约2 ~ 4 个月, 对垂直分量其幅度约3.5~ 11.0nT, 而磁偏角的幅度约0.1′~ 1.0′, 因此认为在将该仪器观测值用作绝对观测值进行地震异常分析时, 应注意回避这种长期漂移变化。

关键词: 分量核旋仪, 自动化, 磁偏角, 装置误差, 漂移

Abstract: This paper studied the inf luence of the direct ional error of vecto r coil on the declination of FHG vector proton precession magnetometer in theory.The result indicates that only the di rectional erro r of the vector coil in east-w est direction has the inf luence on the declination. This paper also analyzed the erro r of observation data w ith the theoretical result, and f inds that there is long-period drif t about the erro r of observation data of declination and horizontal intensity of this magnetometers with the drift of directional error of the vector coil.The est imated drif t cycle ranges 2 ~ 4 months, the drift quanti ty of vertical intensity is about 3.5 ~ 11.0 nT, the declination is 0.1′~ 1.0′.The sug gestion is also proposed that the drif t must be avoided in analy sis of seismomagnetic precursor.

Key words: Vector proton precession magnetometer, Automatic, Declination, Directionalerror, Drift

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