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Sensors 2017, 17(9), 2127; https://doi.org/10.3390/s17092127

Response Characteristics and Experimental Study of Underground Magnetic Resonance Sounding Using a Small-Coil Sensor

1
College of Construction Engineering, Jilin University, Changchun 130026, China
2
College of Institute of Instrument Science and Electrical Engineering, Jilin University, Changchun 130026, China
3
Key Laboratory of Geophysics Exploration Equipment, Ministry of Education of China, Changchun 130026, China
4
Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China
*
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 15 September 2017
(This article belongs to the Special Issue Magnetic Sensors and Their Applications)
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Abstract

Due to its unique sensitivity to hydrogen protons, magnetic resonance sounding (MRS) is the only geophysical method that directly detects water and can provide nondestructive information on subsurface aquifer properties. The relationship between the surface MRS signal and the location and characteristics of aquifers using large-coil (typically 50–150 m) sensors has been discussed based on forward modelling and experiments. However, few researchers have studied underground MRS using a small-coil sensor. In this paper, a parametric study and a large-scale physical model test were conducted to shed light on the critical response characteristics of underground MRS using a small-coil sensor. The effects of the size and number of turns of the transmitter coil and receiver coil, the geomagnetic declination, the geomagnetic inclination, and the position, thickness, and water content of a water-bearing structure on the performance of the underground MRS were studied based on numerical simulations. Furthermore, we derived the kernel function and underground MRS signal curves for a water-bearing structure model based on the simulations. Finally, a large-scale physical model test on underground MRS using a small-coil sensor was performed using a physical test system for geological prediction of tunnels at Shandong University. The results show that the inversion results of the physical model test were in good agreement with the physical prototype results. Using both numerical modeling and physical model tests, this study showed that underground MRS using a small-coil sensor can be used to predict water-bearing structures in underground engineering. View Full-Text
Keywords: magnetic resonance sounding; small-coil sensor; underground engineering; detection magnetic resonance sounding; small-coil sensor; underground engineering; detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Qin, S.; Ma, Z.; Jiang, C.; Lin, J.; Xue, Y.; Shang, X.; Li, Z. Response Characteristics and Experimental Study of Underground Magnetic Resonance Sounding Using a Small-Coil Sensor. Sensors 2017, 17, 2127.

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