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Open AccessArticle

Design of Meter-Scale Antenna and Signal Detection System for Underground Magnetic Resonance Sounding in Mines

by Xiaofeng Yi 1,2, Jian Zhang 2, Tiehu Fan 1,2, Baofeng Tian 1,2,* and Chuandong Jiang 1,2,*
1
Key Laboratory of Geophysical Exploration Equipment, Ministry of Education, Jilin University, Changchun 130061, China
2
College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(3), 848; https://doi.org/10.3390/s18030848
Received: 19 January 2018 / Revised: 25 February 2018 / Accepted: 6 March 2018 / Published: 13 March 2018
(This article belongs to the Special Issue Magnetic Sensors)
Magnetic resonance sounding (MRS) is a novel geophysical method to detect groundwater directly. By applying this method to underground projects in mines and tunnels, warning information can be provided on water bodies that are hidden in front prior to excavation and thus reduce the risk of casualties and accidents. However, unlike its application to ground surfaces, the application of MRS to underground environments is constrained by the narrow space, quite weak MRS signal, and complex electromagnetic interferences with high intensities in mines. Focusing on the special requirements of underground MRS (UMRS) detection, this study proposes the use of an antenna with different turn numbers, which employs a separated transmitter and receiver. We designed a stationary coil with stable performance parameters and with a side length of 2 m, a matching circuit based on a Q-switch and a multi-stage broad/narrowband mixed filter that can cancel out most electromagnetic noise. In addition, noises in the pass-band are further eliminated by adopting statistical criteria and harmonic modeling and stacking, all of which together allow weak UMRS signals to be reliably detected. Finally, we conducted a field case study of the UMRS measurement in the Wujiagou Mine in Shanxi Province, China, with known water bodies. Our results show that the method proposed in this study can be used to obtain UMRS signals in narrow mine environments, and the inverted hydrological information generally agrees with the actual situation. Thus, we conclude that the UMRS method proposed in this study can be used for predicting hazardous water bodies at a distance of 7–9 m in front of the wall for underground mining projects. View Full-Text
Keywords: magnetic resonance sounding; underground; mine; antenna; antenna matching; data process magnetic resonance sounding; underground; mine; antenna; antenna matching; data process
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Yi, X.; Zhang, J.; Fan, T.; Tian, B.; Jiang, C. Design of Meter-Scale Antenna and Signal Detection System for Underground Magnetic Resonance Sounding in Mines. Sensors 2018, 18, 848.

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