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Related Experiment Video

Updated: Jul 12, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
00:08

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

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Rotating cantilever-based low-frequency double-fiber grating acceleration sensor.

Li Hong1,2, Menglin Mai1,2, Ruilei Zhang1,2

  • 1Institute of Disaster Prevention, Sanhe Hebei 065201, China.

The Review of Scientific Instruments
|October 20, 2023
PubMed
Summary
This summary is machine-generated.

A novel fiber Bragg grating (FBG) acceleration sensor was developed for accurate low-frequency vibration measurement. This high-sensitivity sensor offers a wide operating band, crucial for structural health monitoring and seismic applications.

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Last Updated: Jul 12, 2025

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Area of Science:

  • Optical sensing technologies
  • Mechanical engineering
  • Geophysics

Background:

  • Acceleration sensors are vital for monitoring infrastructure like bridges and dams, and for geological exploration.
  • Accurate measurement of low-frequency vibration signals remains a challenge for conventional sensors.

Purpose of the Study:

  • To design and develop a high-sensitivity, wide-low-band fiber Bragg grating (FBG) acceleration sensor.
  • To address the limitations of existing sensors in accurately measuring low-frequency vibrations.

Main Methods:

  • A sensor mechanics model was developed and optimized.
  • Simulations were performed using ANSYS Workbench.
  • A physical sensor was fabricated and tested on a low-frequency platform.

Main Results:

  • The sensor exhibits a natural frequency of 78 Hz and an operating frequency band of 1-55 Hz.
  • Achieved a high sensitivity of 1127.2 pm/g with a dynamic range of 86.45 dB.
  • Demonstrated transverse interference immunity below 5.45% and excellent temperature compensation.

Conclusions:

  • The developed FBG acceleration sensor offers high sensitivity and a wide low-frequency band.
  • The sensor's performance characteristics make it suitable for applications requiring precise low-frequency vibration detection.
  • This design provides a valuable reference for future FBG acceleration sensor development.