Enabling surface nuclear magnetic resonance at high-noise environments using a pre-polarization pulse
Enabling surface nuclear magnetic resonance at high-noise environments using a pre-polarization pulse
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DOI：
10.1093/gji/ggx490
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发表时间：
2018-02
影响因子：
2.8
通讯作者：
Tingting Lin;Yujing Yang;Fei Teng;M. Müller‐Petke
中科院分区：
文献类型：
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作者：
Tingting Lin;Yujing Yang;Fei Teng;M. Müller‐Petke
地面核磁共振技术近年来在水文调查中得到了广泛的应用。不幸的是，检测到的SNMR信号被限制在几十纳伏，因此容易受到环境噪声的影响。虽然预极化脉冲，以提高检测到的信号幅度是常见的实验室应用，SNMR场测试只利用激励脉冲，直到现在。在中国进行的测量中，我们证明了在SNMR脉冲序列中添加预极化场是可行的，并且允许在噪声情况下可靠地检测SNMR信号，否则禁止信号检测。我们介绍了一个前极化使用SNMR的正演模拟，并提出了一个三层模型，从逆模拟，满足现场实验的观测数据。我们希望这一发展为SNMR技术开辟新的应用，特别是在高噪声水平的地方，如活跃的矿井。
The technique of surface nuclear magnetic resonance (SNMR) has been widely used for hydrological investigations in recent years. Unfortunately, the detected SNMR signals are limited to tens of nanovolts and are thus susceptible to environmental noise. While pre-polarization pulses to enhance the detected signal amplitudes are common in laboratory applications, SNMR field testing has only utilized excitation pulses until now. In conducting measurements in China, we demonstrate that adding a pre-polarization field to the SNMR pulse sequence is feasible and allows for the reliable detection of SNMR signals in noisy scenarios that otherwise prohibit signal detection. We introduce a forward modelling for pre-polarization using SNMR and present a three-layer model obtained from inverse modelling that satisfies the observed data from the field experiment. We expect this development to open up new applications for SNMR technology, especially in high-noise level places, such as active mines.