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A novel progressive wave gyroscope based on acousto-optic effects.

Lu Tian1, Qiang Shen1, Honglong Chang1

  • 1Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospacea, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, 710072 China.

Microsystems & Nanoengineering
|September 5, 2022
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Summary

This study introduces a novel acousto-optic gyroscope for measuring angular velocity. It achieves significantly enhanced sensitivity and impact resistance compared to traditional surface acoustic wave (SAW) gyroscopes.

Keywords:
Optical sensorsSensors

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Area of Science:

  • Photonics and Acoustics
  • Inertial Sensing Technologies
  • Materials Science

Background:

  • Traditional surface acoustic wave (SAW) gyroscopes rely on frequency shifts to measure angular velocity.
  • Existing gyroscope technologies face limitations in sensitivity and impact resistance.
  • Acousto-optic effects offer a potential pathway for novel sensing mechanisms.

Purpose of the Study:

  • To propose and numerically investigate a new progressive wave gyroscope utilizing acousto-optic effects.
  • To enhance gyroscope sensitivity and impact resistance beyond conventional SAW devices.
  • To explore the measurement of rotational angular velocity via optical power intensity changes.

Main Methods:

  • Development of a novel gyroscope design based on acousto-optic principles.
  • Utilizing three-dimensional finite element analysis for SAW excitation and optical detection modeling.
  • Investigating the relationship between geometric parameters, mechanical strain, and optical output.

Main Results:

  • The proposed gyroscope achieves a theoretical sensitivity of 1.8647 (mW/m^2)/(rad/s).
  • Demonstrated high impact resistance of 220,000 g.
  • Sensitivity enhancement by four orders of magnitude compared to traditional SAW gyroscopes through normalization.

Conclusions:

  • The acousto-optic gyroscope offers superior performance, particularly in sensitivity and impact resistance.
  • The novel structure integrates benefits of microscale vibrating and optical gyroscopes.
  • This technology presents a promising solution for advanced inertial devices.