First Measurements of Surface Nuclear Magnetic Resonance Signals in a Grounded Bipole
First Measurements of Surface Nuclear Magnetic Resonance Signals in a Grounded Bipole
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DOI：
10.1029/2019gl084342
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发表时间：
2019-08
影响因子：
5.2
通讯作者：
A. Davis;N. Skibbe;M. Müller‐Petke
中科院分区：
文献类型：
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作者：
A. Davis;N. Skibbe;M. Müller‐Petke
表面核磁共振（表面NMR）探测是一种可以直接检测地下水的地球物理技术。普通的表面核磁共振探测是通过充当发射器和接收器的导线环来实现的。我们通过使用接地电双极作为测量传感器来扩展该技术的能力。我们首次成功测量了在西澳大利亚珀斯郊外的海滩上使用接地电极对采集的表面核磁共振信号。对现有方程的简单改变足以为测量技术的变化提供正演模型，并且所得的地下水模型与一致的环路探测相一致。我们的结果为表面核磁共振信号的新颖探测技术开辟了领域，这可能对近地表地下水调查产生广泛影响。
Surface nuclear magnetic resonance (surface NMR) soundings are geophysical techniques that offer direct detection of groundwater. Ordinary surface NMR soundings are achieved with a wire loop that acts as both transmitter and receiver. We extend the capability of the technique by using a grounded electrical bipole as the measurement sensor. We provide the first successful measurements of surface NMR signals taken with a grounded electrode pair on a beach outside Perth, Western Australia. Simple changes to existing equations are sufficient to provide forward models for the changes in measurement technique, and the resulting groundwater models are consistent with coincident loop soundings. Our result opens the field for novel sounding techniques of surface NMR signals that could have broad impact on near‐surface groundwater investigations.