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MEMS-Based Electrochemical Seismometer with a Sensing Unit Integrating Four Electrodes
Wenjie Qi1,2, Chao Xu1,2, Bowen Liu1,2
1State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.
Micromachines
|July 2, 2021
Summary
This study introduces a novel silicon-glass-silicon wafer process for fabricating highly consistent electrochemical seismometer sensing units. The new design demonstrates performance comparable to commercial seismometers, offering a promising tool for seismic monitoring.
Area of Science:
- Geophysics
- Materials Science
- Sensor Technology
Background:
- Electrochemical seismometers are crucial for seismic monitoring.
- Existing fabrication methods can face challenges in consistency and alignment accuracy.
Purpose of the Study:
- To develop a new, highly consistent sensing unit for electrochemical seismometers.
- To validate the performance of the developed device against commercial standards.
Main Methods:
- Fabrication of a sensing unit using a single silicon-glass-silicon bonded wafer with integrated electrodes.
- Parameter design and simulations to optimize sensing unit characteristics.
- Experimental validation of sensitivity, stabilization time, and response to ground motion.
Main Results:
- The single-wafer fabrication process significantly improved sensing unit consistency due to high alignment accuracy.
- Sensitivity decreased with fewer flow holes; stabilization time decreased with thinner glass layers.
- Peak sensitivity achieved was 5345.45 ± 43.78 V/(m/s) at 2 Hz, with performance comparable to commercial CME6011 seismometers.
Conclusions:
- The novel fabrication process yields highly consistent and high-performance electrochemical seismometers.
- The developed device shows comparable noise levels and response characteristics to commercial counterparts.
- This technology offers a viable and effective tool for various seismic monitoring applications.
