| 地下核磁共振小尺寸线圈设计和实验 |
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| 引用本文： | 林君,张健,易晓峰.地下核磁共振小尺寸线圈设计和实验[J].地球物理学报,2017,60(11):4184-4193. |
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| 作者姓名： | 林君 张健 易晓峰 |
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| 作者单位： | 1. 吉林大学仪器科学与电气工程学院, 长春 130026;2. 吉林大学地球信息探测仪器教育部重点实验室, 长春 130026 |
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| 基金项目： | 国家自然科学基金-青年基金项目（40504086），国家重大科学仪器设备开发专项项目（2011YQ030133）资助. |
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| 摘 要： | 很多国家在进行隧道挖掘、地下矿体开采时,经常会遇到突水涌泥事故.核磁共振方法(Magnetic Resonance Sounding,MRS)作为目前唯一一种直接找水的地球物理技术,在探测诱发灾害的水体方面具有明显的优势.本文首先给出了多匝分离式线圈的MRS信号响应和核函数的计算公式,分析了线圈的匝数、边长和含水层位置对MRS信号响应的影响.分析表明,在限定空间内,利用多匝分离式线圈的设计方法可以提高小尺寸线圈的探测能力.同时,对高匝数线圈给探测系统带来的不利因素进行了分析和改进.最后,为了验证本研究所采用的方法,利用6 m边长的方形线圈和改进型MRS探测系统在中国温州一处在建隧道内的地下场地进行实地探测,探测结果与瞬变电磁方法结果对比表明,6 m边长的方形线圈可以对地下30 m内的含水层进行有效探测.
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| 关 键 词： | 核磁共振 小尺寸线圈 地下水 隧道 |
| 收稿时间： | 2016-12-29 |
Design and experiment of small antenna for magnetic resonance sounding in underground applications |
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| LIN Jun,ZHANG Jian,YI Xiao-Feng.Design and experiment of small antenna for magnetic resonance sounding in underground applications[J].Chinese Journal of Geophysics,2017,60(11):4184-4193. |
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| Authors: | LIN Jun ZHANG Jian YI Xiao-Feng |
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| Institution: | 1. College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130026, China;2. Key laboratory of Geo-exploration Instrumentation, Ministry of Education, Jilin University, Changchun 130026, China |
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| Abstract: | Water inundation and mud accidents often occur in many countries for tunnel excavation and underground ore mining. Magnetic Resonance Sounding (MRS), as the only technique for directly detecting groundwater, has obvious advantages in detecting the water which may induce disaster. In this paper, we introduce the calculation formula of the MRS signal response and kernel function for the multi-turn separated coils. Based on the analysis of the MRS signal response to the coil turns, sides and aquifer positions, we show that the designed multi-turn separated coils can improve the detection capability using a small size coil in the limited space. In addition, we analyze and improve the MRS detection system with multi-turn coil. Finally, in order to verify the system developed in this paper, a six-meter-side square coil and the improved MRS detection system were used in a tunnel located in Wenzhou, China. Moreover, we compared the results to the transient electromagnetic method. It shows that the six-meter-side square coil can detect effectively the aquifer within 30 m underground. |
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| Keywords: | Magnetic resonance sounding Small size coil Groundwater Tunnel |
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