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A new L-shaped rigid beam FBG acceleration sensor.

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This summary is machine-generated.

This study introduces an improved Fiber Bragg Grating (FBG) acceleration sensor. The novel design enhances low-frequency vibration detection for applications like seismic monitoring.

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Area of Science:

  • Engineering
  • Physics
  • Materials Science

Background:

  • Fiber Bragg Grating (FBG) sensors are crucial for monitoring applications.
  • Low-frequency vibration measurement presents challenges in sensitivity and accuracy.
  • Existing FBG acceleration sensors often suffer from low sensitivity at low frequencies.

Purpose of the Study:

  • To develop a novel FBG acceleration sensor with enhanced low-frequency sensitivity.
  • To optimize structural parameters for improved sensor performance.
  • To address the issue of transverse crosstalk in FBG acceleration sensors.

Main Methods:

  • Designed an FBG acceleration sensor incorporating an L-shaped rigid beam and a spring structure with bearings.
  • Analyzed and optimized structural parameters using Origin theory.
  • Performed static stress and modal simulations with COMSOL.
  • Built a test system to evaluate the sensor's performance.

Main Results:

  • Achieved a natural frequency of 57 Hz.
  • Demonstrated a flat sensitivity response from 1-35 Hz.
  • Reported an acceleration sensitivity of 1241.85 pm/g with R² = 0.9997.
  • Achieved a dynamic range of 89.83 dB and transverse crosstalk of -26.20 dB.

Conclusions:

  • The proposed FBG acceleration sensor significantly improves low-frequency vibration measurement.
  • The optimized design effectively amplifies signals and suppresses crosstalk.
  • This sensor design offers a valuable reference for enhancing FBG sensor capabilities in seismic and structural monitoring.