ZHU Wan-Hua,
DI Qing-Yun,
LIU Lei-Song et al
.2013.Development of search coil magnetometer based on magnetic flux negative feedback structure.Chinese Journal Of Geophysics,56(11): 3683-3689,doi: 10.6038/cjg20131109
Development of search coil magnetometer based on magnetic flux negative feedback structure
ZHU Wan-Hua1,3, DI Qing-Yun2, LIU Lei-Song1, YAN Bin1,3, LIU Kai1,3, FANG Guang-You1
1. Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences (CAS) Institute of Electronics, CAS, Beijing 100190, China; 2. Key Laboratory of Engineering Geomechanics, Chinese Academy of Sciences (CAS), Institute of Geology and Geophysics, CAS, Beijing 100029, China; 3. University of Chinese Academy of Sciences, Beijing 100039, China
Abstract：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 m√HZ
to 1 k√HZ
, 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.
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