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Updated: Oct 13, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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A Medium-Frequency Fiber Bragg Grating Accelerometer Based on Flexible Hinges.

Zichuang Li1, Lei Liang1, Hui Wang1

  • 1National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China.

Sensors (Basel, Switzerland)
|November 13, 2021
PubMed
Summary
This summary is machine-generated.

A new fiber Bragg grating (FBG) accelerometer uses flexible hinges for enhanced sensitivity and temperature compensation. This novel sensor design meets strict requirements for mechanical and aerospace applications.

Keywords:
accelerometerfiber Bragg gratingflexible hingevibration monitoring

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Area of Science:

  • * Mechanical Engineering
  • * Aerospace Engineering
  • * Sensor Technology

Background:

  • * Medium-frequency accelerometers are crucial for mechanical, aerospace, and weapon systems.
  • * Existing sensors face challenges with resonance frequency and sensitivity requirements.
  • * Fiber Bragg Grating (FBG) sensors offer potential for high-performance acceleration measurement.

Purpose of the Study:

  • * To propose and analyze a novel medium-frequency accelerometer utilizing fiber Bragg gratings and flexible hinges.
  • * To enhance sensor sensitivity and achieve temperature self-compensation.
  • * To validate the sensor's performance through theoretical analysis and experimental testing.

Main Methods:

  • * Development of a novel accelerometer structure based on FBG and flexible hinges.
  • * Theoretical analysis of the sensor's structure, principle, and sensing characteristics.
  • * Numerical analysis for determining optimal structure parameters.
  • * Experimental validation of sensor performance, including sensitivity and frequency response.

Main Results:

  • * The proposed differential structure effectively doubles sensor sensitivity.
  • * Achieved a resonance frequency of approximately 2800 Hz.
  • * Demonstrated a sensitivity of 21.8 pm/g within the 50-1000 Hz frequency range.
  • * Confirmed good temperature self-compensation and lateral anti-interference capabilities.

Conclusions:

  • * The novel FBG accelerometer design meets stringent performance criteria for medium-frequency applications.
  • * The differential structure enhances sensitivity while mitigating temperature effects.
  • * The sensor exhibits robust performance, making it suitable for demanding environments in mechanical and aerospace fields.