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Design and Performance Verification of a Non-Contact Geoelectric Field Sensor Based on a Three-Layer Composite
Shaohong Wang1,2, Da Lei1,2,3, Qihui Zhen1,2,3
1Key Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Sensors (Basel, Switzerland)
|August 13, 2026
Summary
This study introduces a novel non-contact geoelectric field sensor for improved geophysical exploration. The innovative design offers high precision and adaptability in challenging terrains, overcoming limitations of traditional methods.
Area of Science:
- Geophysics
- Sensor Technology
- Materials Science
Background:
- Traditional geoelectric field sensors face challenges like terrain adaptability and signal interference.
- Existing non-contact sensors struggle with insufficient capacitance, impedance matching, and noise suppression for weak signals.
- Precise acquisition of natural microvolt-level geoelectric fields is crucial for geophysical applications.
Purpose of the Study:
- To develop an innovative non-contact geoelectric field sensor overcoming limitations of existing technologies.
- To achieve high-precision, stable geoelectric field detection in diverse and challenging environments.
- To provide a deployable, robust alternative to traditional buried electrodes.
Main Methods:
- Designed a three-layer composite non-contact sensor utilizing a parallel-plate capacitor principle.
- Incorporated a silver paste electrode, PZT piezoelectric ceramic, and a flexible silicon-based ground layer.
- Developed a specialized signal-conditioning circuit with ultra-low noise operational amplifiers for high-impedance signal acquisition.
Main Results:
- The sensor achieved non-contact capacitive coupling, adapting to ground irregularities for stable capacitance.
- The signal-conditioning circuit demonstrated an input impedance >10 TΩ, bandwidth of 0.02 Hz-20 kHz, and noise density <1.5 μV/√Hz at 10 Hz.
- Field experiments showed near-identical performance to commercial electrodes (cross-correlation >0.98) with rapid deployment and no burial required.
Conclusions:
- The novel non-contact sensor offers ease of deployment, strong environmental adaptability, and high precision for weak signal acquisition.
- Structurally eliminating electrode potential difference enhances stability and reduces interference.
- The sensor is suitable for long-term geoelectric field observations in extreme environments, offering a high-performance alternative.
