• 责任者：Zhu Wanhua (Key Laboratory of Electromagnetic Radiation and Sensing Technology ; Institute of Electronics ; CAS ; Beijing 100190 ; China) ; Di Qingyun
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(11)
• 关键词：大地电磁测深 ; telluric electromagnetic sounding ; 仪器 ; instruments
• 页码：p.3683-3689
• 图表：9 illus., 22 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     The search coil magnetometer （SCM） is a kind of magnetic sensors which is applied widely in oil and mineral explorations,earthquake monitoring,space research and so on.Also SCM is one of indispensable roles in EM exploration device.Funded by China＇s SinoProbe Plan,the SCM with high sensitivity for the Magnetotellurics （MT） is developed.In this article,the SCM with magnetic flux negative feedback structure is described.The chopper stabilized circuit is applied for removal of the 1/f noise in low frequency.The mu-metal core with high permeability increases the sensitivity of the SCM.The theoretical and test results show that the bandwidth of the SCM is from 1 mHz to 1 kHz,the noise level at 0.1 Hz is 1.5 pT/（√）Hz,at 1 Hz is 0.15 pT/（√）Hz,and at 10 Hz is 0.03 pT/（√）Hz,respectively.The length of the SCM is 96 cm,diameter is 60 mm,and the weight is less than 6 kg.The SCM presented here can meet the demand of the magnetotellurics （MT） method.