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Design of Low-Frequency Extended Signal Conditioning Circuit for Coal Mine Geophone
Zhigang Deng1,2, Zewei Lian1, Jinjiao Ye1
1China Coal Research Institute, Beijing 100013, China.
Sensors (Basel, Switzerland)
|October 16, 2025
Summary
This study introduces a signal conditioning (SC) circuit to enhance magnetoelectric geophones for coal mine microseismic monitoring. The SC circuit significantly improves low-frequency detection down to 0.16 Hz, crucial for underground environments.
Area of Science:
- Geophysics
- Mining Engineering
- Electrical Engineering
Background:
- Traditional magnetoelectric geophones are vital for coal mine microseismic monitoring.
- Existing geophones have insufficient low-frequency measurement capabilities, failing to meet underground monitoring needs as low as 0.1 Hz.
Purpose of the Study:
- To develop a signal conditioning (SC) circuit to improve the low-frequency response of magnetoelectric geophones.
- To enable geophones to effectively monitor signals down to 0.1 Hz in underground coal mines.
Main Methods:
- Designed a signal conditioning (SC) circuit utilizing an extended filtering method.
- Conducted simulations and experimental tests to validate the SC circuit's performance.
- Evaluated the geophone's cut-off frequency and noise interference resistance.
Main Results:
- The SC circuit successfully reduced the EST-4.5C geophone's cut-off frequency from 4.5 Hz to 0.16 Hz.
- The designed SC circuit introduced minimal noise due to its simple structure.
- The enhanced geophone demonstrated strong resistance to noise interference in complex conditions.
Conclusions:
- The proposed SC circuit is a feasible solution for improving seismic geophone capability in coal mines.
- This enhancement is critical for detecting low-frequency vibration signals essential for underground safety and monitoring.
- The technology offers a valuable upgrade for microseismic monitoring in challenging mining environments.
Keywords:
coal mine microseismic monitoringlow-frequency extensionmagnetoelectric geophonesignal conditioning circuitMore Related Videos
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