Experimental Research on Transient Electromagnetic Multi-Turn Minor Loop Device

Abstract:

There is the polar distance selection of dipole device, the location determination of recording points, the resolution capability of multiple anomalies and other problems existing in the practical application of transient electromagnetic method in multi-turn minor loop device. Through physical simulation experiments, this paper gives experimental comparisons of polar distance, recording points, and the resolution capability of two anomalies in a certain interval between dipole device and overlapping device. The experimental results show that: the dipole device has the better resolution capability of small polar distance, 1.25 times wire-frame side length is appropriate for general selection of polar distance, and the maximum distance should not exceed 1.5 times wire-frame side length, the recording point is located in the midpoint position of transmitting and receiving coils; while the overlapping device has the obviously higher resolution of double anomalies in a certain interval than dipole device, and the minimum resolution is about 1.5 times wire-frame side length. These characteristics provide the realistic basis for reasonable selections and optimization designs of multi-turn minor loop observation system.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 3780-3787
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.3780
• Online since: October 2013
• Authors: Kai Zhang*, Jun Gao, Xiao Xia Hao
• Keywords: Dipole Device, Multi-Turn Minor Loop, Overlapping Loop Device, Resolution Capability

References

[1] Bangyuan Jiang. Applied near zone magnetic source transient electromagnetic exploration [M]. Beijing: Geological Publishing House, (1998).

[2] Zhihai Jiang, Jianhua Yue, Shucai Liu. Experiment of mine transient electromagnetic observation system of small multi-turn coincident configuration [J]. Journal of China Coal Society, 2007, 32(11): 1152-1156(In Chinese).

[3] Shucai Liu, Jianhua Yue. Application of hydrology Geophysical Technology in coal mine [M]. Xuzhou: China University of Mining and Technology Press, (2005).

[4] Jiankang Yin, Shu Yan, Mingsheng Chen. Small transmitter loop device and its application in transient electromagnetic method [J]. Coal Geology and Exploration, 2007, 35（3）: 66 - 68.

[5] Liu Zhixin, Shucai Liu, Yangguang Liu. Research on transient electromagnetic field of mine water bearing structure by physical model experiment [J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(2): 259-266.

[6] Jingcun Yu, Zhixin Liu, Jianhua Yue, Development and pospect of geophysical technology in deep mining [J]. Progress in Geophysics. 2007, 22(2): 586-592.

[7] Haiyan Yang, Jianhua Yue, Wenwu Hu. Characteristics of multi-turn loop self-inductance of the early transient electromagnetic signal [J]. Computing Techniques For Geophysical and Geochemical Exploration, 2007, 29(2): 96-98.

[8] Zhixin Liu, Jianhua Yue, Yangguang Liu. Application of geohpysical Technology in forecast brust Water of Coal Mining [J] Chinese Journal of Engineering Geophysics, 2007, 4(1): 9-14.

[9] Chun Guo, Baizhou Liu, Denghai Bai. Prediction of water disasters ahead of tunneling in coal mine using continuous detection by TEM [J]. Selismology and Geology, 2006, 28(3): 456-462.

[10] Nabighian, Misac N. Electromagnetic Methods in Applied Geophysics (Theory)[M]. Beijing: The Geological Publishing House, (1992).

[11] Lee T, Lewis R. Transient EM response of a large loop on alayered ground [J]. Geophysical Prospecting, 1974, 22: 430-444.

DOI: 10.1111/j.1365-2478.1974.tb00097.x