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Measurement of vibrating modes for a shell resonator by using dual-interferometers
1Department of Navigation Systems, Hanwha Munitions Corporation, 10, Yuseong-daero 1366, Yuseong-gu, Daejeon 34101, South Korea.
The Review of Scientific Instruments
|April 4, 2023
Summary
Dual Michelson interferometers precisely measure shell resonator vibration modes, resonance frequencies, and quality factors. This method enhances rotation sensor performance by enabling single-detection mode identification.
Area of Science:
- Mechanical Engineering
- Physics
- Materials Science
Background:
- Shell resonators exhibit vibration modes like the wine-glass mode.
- Coriolis forces cause precession in these modes, enabling rotation sensing.
- High quality factor (Q) is crucial for noise reduction in rotation sensors.
Purpose of the Study:
- To demonstrate a method for measuring vibration modes, resonance frequency, and quality factor of shell resonators.
- To utilize dual Michelson interferometers for simultaneous measurement of resonator motion.
- To analyze the performance of a blow-torched shell resonator for rotation sensing applications.
Main Methods:
- Employing dual Michelson interferometers to simultaneously capture X and Y motions of a vibrating shell resonator.
- Exciting resonator vibrations using a buzzer attached to a mounting wall.
- Analyzing interferometric phase conditions (in-phase/out-of-phase) to distinguish between different vibration modes (e.g., wine-glass, tilting).
Main Results:
- Successfully measured the n=2 wine-glass mode and tilting mode of a shell resonator.
- Obtained high quality factor values: Q = 2.7 × 10⁵ for wine-glass mode and Q = 2.2 × 10⁴ for tilting mode at 9.7 mTorr.
- Measured resonant frequencies of 6.53 kHz for the wine-glass mode and 3.12 kHz for the tilting mode.
- Demonstrated mode identification via single detection, eliminating the need for full resonator scanning.
Conclusions:
- The dual Michelson interferometer method effectively characterizes shell resonator dynamics.
- The measured high Q factors indicate potential for sensitive rotation sensing.
- This technique offers an efficient way to identify vibration modes for gyroscope applications.
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