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Highly Sensitive Force Sensor Based on High-Q Asymmetric V-Shaped CaF2 Resonator.

Deyong Wang1, Jiamin Rong2, Jianglong Li1

  • 1Key Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, China.

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Summary

This study introduces a novel force-sensing system using a high-quality factor (high-Q) asymmetric V-shaped calcium fluoride (CaF2) resonator. This whispering gallery mode (WGM) resonator achieves high sensitivity for precise force measurements.

Keywords:
WGM resonatorasymmetric V-shapedforce sensor

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Area of Science:

  • Optics
  • Materials Science
  • Sensor Technology

Background:

  • Whispering gallery mode (WGM) resonators offer high-quality factors and narrow line widths, enabling sensitive detection of external changes.
  • Existing WGM resonator applications are limited in force-sensing capabilities.

Purpose of the Study:

  • To propose and demonstrate a novel force-sensing system utilizing a high-Q asymmetric V-shaped CaF2 resonator.
  • To enhance the deformation of the resonator under force loading by optimizing structural parameters.

Main Methods:

  • Designed an asymmetric V-shaped CaF2 resonator with a high-Q factor.
  • Employed a dispersion coupling mechanism to link resonator deformation to applied force.
  • Investigated the relationship between structural parameters and resonator deformation under force.
  • Measured the system's sensitivity and force-sensing resolution.

Main Results:

  • The asymmetric V-shaped resonator demonstrated improved deformation under force loading through structural parameter adjustment.
  • Achieved a force-sensing sensitivity of 18.84 V/N.
  • Determined a force-sensing resolution of 8.49 μN.

Conclusions:

  • The proposed force-sensing system based on a WGM resonator offers a viable solution for high-sensitivity force measurements.
  • Optimizing the geometry of asymmetric V-shaped resonators enhances their performance in force-sensing applications.