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- W2919488268 abstract "The magnetic resonance sounding (MRS) method can noninvasively, directly, and quantitatively detect groundwater and forecast the potential for a water-induced disaster during tunnel construction. However, due to the spatial limitations of underground engineering, the signal-to-noise ratio (SNR) of the receiving signal is low (<; 1), which severely limits the reliability of the disaster warning. Thus, the question of how to design the meter-scale antenna and improve the SNR has become the bottleneck that restricts the successful application of the underground MRS method. To address this problem, we comprehensively consider the factors of detection depth, signal amplitude, and antenna size and weight using theoretical calculations and model simulations in this paper. We determine that an 8-turn transmitting antenna and a 30-turn receiving antenna with both side lengths of 6 m constitute an effective combination for achieving reliable detection of large water-bearing structures. Meanwhile, we propose a front-end matching circuit for a high-inductance antenna to solve the problem of attenuation of the signal amplitude due to high impedance and successfully increase the SNR from 1.12 to 5.13. Finally, in the tunnel of the Shanghai-Kunming high-speed railway of China, we perform the field measurement of an underground river and validate the practicability of the proposed antenna and matching circuit." @default.
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- W2919488268 date "2019-12-01" @default.
- W2919488268 modified "2023-10-17" @default.
- W2919488268 title "Design of Magnetic Resonance Sounding Antenna and Matching Circuit for the Risk Detection of Tunnel Water-Induced Disasters" @default.
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- W2919488268 doi "https://doi.org/10.1109/tim.2019.2896372" @default.
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