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Resonant frequency detection and adjustment method for a capacitive transducer with differential transformer bridge
1MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
The Review of Scientific Instruments
|June 2, 2014
Summary
Ultra-sensitive accelerometers rely on inductive-capacitive resonant bridge transducers. Maintaining optimal performance requires precise AC pumping frequency alignment with the bridge
Area of Science:
- Instrumentation and Measurement
- Sensor Technology
- Aerospace Engineering
Background:
- Capacitive transducers with differential transformer bridges are crucial for ultra-sensitive space accelerometers.
- Their simple structure and high resolution make them ideal for demanding applications.
Purpose of the Study:
- To analyze the front-end electronics of inductive-capacitive resonant bridge transducers.
- To investigate the impact of frequency mismatch on transducer performance.
- To propose a method for maintaining high resolution.
Main Methods:
- Theoretical analysis of front-end electronics and frequency mismatch effects.
- Development and experimental verification of a pre-scanning method for resonant frequency determination.
- Adjustment of operating frequency or tuning capacitance.
Main Results:
- Transducer performance is highly dependent on AC pumping frequency matching the resonant frequency.
- Output voltage noise increases by approximately a factor of 3 with a 5% AC frequency variation or 10% capacitance variation.
- The proposed pre-scanning and adjustment method effectively mitigates performance degradation.
Conclusions:
- Precise frequency control is essential for optimal performance of inductive-capacitive resonant bridge transducers.
- The developed pre-scanning method ensures high resolution by compensating for frequency mismatches.
- This research contributes to the reliability of ultra-sensitive accelerometers.
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