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Signal acquisition module design for multi-channel surface magnetic resonance sounding system
Tingting Lin1, Wuqiang Chen1, Wenyuan Du1
1College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China and Key Lab of Geo-Exploration Instrumentation of Ministry of Education, Jilin University, Changchun 130061, China.
The Review of Scientific Instruments
|December 3, 2015
Summary
This study developed a signal acquisition module for multi-channel magnetic resonance sounding (MRS) to image groundwater. The system effectively suppresses coil interference and achieves high sensitivity for precise aquifer imaging.
Area of Science:
- Geophysics
- Hydrogeology
- Electrical Engineering
Background:
- Precise 2D/3D imaging of fissure or karst water requires advanced multi-channel magnetic resonance sounding (MRS) systems.
- Key challenges in MRS system design include acquiring weak nano-volt signals and mitigating mutual coil coupling.
Purpose of the Study:
- To design and validate a signal acquisition module for multi-channel MRS systems.
- To address the challenges of weak signal detection and inter-coil interference in groundwater investigations.
Main Methods:
- A passive low-pass filter (RC circuit) was employed to reduce mutual coupling between coils.
- Four low-noise operational amplifiers (LT1028, OPA124, AD745, OP27) were evaluated for system noise performance.
- Three LT1028 operational amplifiers, connected in parallel, were selected as the preamplifier for their superior sensitivity.
Main Results:
- The developed preamplifier achieved a sensitivity of 1.4 nV/√Hz at 2 kHz.
- The passive low-pass filter effectively suppressed mutual coupling effects between adjacent coils.
- 2D MRS groundwater investigation results in Changchun, China, showed consistency with drilling log data.
Conclusions:
- The developed signal acquisition module demonstrates effective performance for 2D MRS groundwater investigations.
- The system's ability to acquire weak signals and suppress interference enables precise subsurface imaging.
- The findings support the advancement of MRS technology for hydrogeological studies.
