磁通门磁力仪背景磁场的自动补偿设计
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摘要
提出一种在单片机的控制下用逐次渐近反馈比较式的背景磁场自动补偿方法,设计了实现高精度自动补偿的硬件电路和程序实现。仪器经自动补偿后,在大约60000nT的背景地磁场中,能使磁力计探头工作在几个nT左右的真正"零背景场"下。适于井下磁力计或其他不能进行实地操作的磁力计的背景场补偿,并有利于磁力计分辨力的提高。同时也实现了仪器观测的自动化、智能化和远程监控。
A novel method of background geomagnetic field auto compensation is presented in this paper,which is based on successive approximation through the way of comparison and feedback.This paper also introduces the design of the high accuracy auto compensation hardware and software algorithm.Result shows that the proposed method can ensure the senor work at ‘zero background magnetic field’ of few nTs under about 60 000 nTs real geomagnetic background.Furthermore,the method presented in this paper can also realize automatic and intelligent observation and remote control of the instrument.
A novel method of background geomagnetic field auto compensation is presented in this paper,which is based on successive approximation through the way of comparison and feedback.This paper also introduces the design of the high accuracy auto compensation hardware and software algorithm.Result shows that the proposed method can ensure the senor work at ‘zero background magnetic field’ of few nTs under about 60 000 nTs real geomagnetic background.Furthermore,the method presented in this paper can also realize automatic and intelligent observation and remote control of the instrument.
引文
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[7]李江,周勋.磁通门磁力仪自动补偿的实现[J].地震地磁观测与研究,2002,23(3):59-64.LI J,ZHOU X.The realization of fluxgate magnetometer auto-compensation[J].Seismological And Geomagnetic Observation And Research,2002,23(3):59-64.
[8]张学孚,陆怡良.磁通门技术[M].北京:国防工业出版社,1995:8-9.ZHANG X F,LUY L.Technology of magnetometer[M].Beijing:National defence industry Press,1995:8-9.
[9]马场清太郎.运算放大器应用电路设计[M]何希才,译.北京:科学出版社,2007:175-180.MACHANGQINGTAILAN.Op amplifier niyoru jitsuyou kairo sekkei[M].HE X C,trans.Beijing:Science Press,2007:175-180.
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