TY - JOUR

T1 - Enabling surface nuclear magnetic resonance at high-noise environments using a pre-polarization pulse

AU - Lin, Tingting

AU - Yang, Yujing

AU - Teng, Fei

AU - Müller-Petke, Mike

N1 - Funding information: This work was supported by the National Foundation of China (Grant Nos 41722405, 2011YQ03113, 20140204022GX and 41374075) and the German Research Council (DFG) (Grant MU 3318/4–1). The authors thank PhDs Yang Zhang and Kun Zhou for their help in instrument system development. This work was supported by the National Foundation of China (Grant Nos 41722405, 2011YQ03113, 20140204022GX and 41374075) and the German Research Council (DFG) (Grant MU 3318/4-1). The authors thank PhDs Yang Zhang and Kun Zhou for their help in instrument system development.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - 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 prepolarization 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 theSNMRpulse 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.

AB - 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 prepolarization 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 theSNMRpulse 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.

KW - Electromagnetic theory

KW - Geomagnetic induction

KW - Hydrogeophysics

KW - Numerical modelling

KW - Remagnetization

UR - http://www.scopus.com/inward/record.url?scp=85042158133&partnerID=8YFLogxK

U2 - 10.1093/gji/ggx490

DO - 10.1093/gji/ggx490

M3 - Article

AN - SCOPUS:85042158133

VL - 212

SP - 1463

EP - 1467

JO - Geophysical journal international

JF - Geophysical journal international

SN - 0956-540X

IS - 2

ER -