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Updated: Jun 25, 2025
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
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A Low-Frequency Fiber Bragg Grating Acceleration Sensor Based on Spring Support and Symmetric Compensation Structure
Lijun Meng1, Panpan Zhu2, Xin Tan2
1State Key Laboratory of Precision Blasting, Jianghan University, Delta Lake Road, No. 8, Wuhan 430056, China.
Sensors (Basel, Switzerland)
|May 25, 2024
Summary
A novel fiber Bragg grating (FBG) acceleration sensor was developed for low-frequency vibration measurement. This flexible sensor achieves a sensitivity of 24.24 pm/g within a 0–60 Hz operating range.
Area of Science:
- Optical Engineering
- Mechanical Engineering
- Sensor Technology
Background:
- Accurate measurement of low-frequency vibration signals is crucial in various engineering applications.
- Existing acceleration sensors may have limitations in sensitivity or operating frequency range for specific low-frequency tasks.
Purpose of the Study:
- To design and validate a novel low-frequency fiber Bragg grating (FBG) acceleration sensor.
- To investigate the sensor's performance characteristics, including sensitivity, resonant frequency, and temperature response.
Main Methods:
- A flexible hinge with spring support and symmetric compensation structure was designed for the FBG acceleration sensor.
- Mechanical modeling was used to derive expressions for sensor sensitivity and resonant frequency.
- ANSYS software was employed for structural parameter optimization and simulation analysis.
- A sensor prototype was fabricated and experimentally evaluated for its amplitude-frequency response, sensitivity, and temperature characteristics.
Main Results:
- The designed sensor prototype exhibited a resonant frequency of 73 Hz.
- The sensor demonstrated an effective operating frequency range of 0–60 Hz.
- The measured sensitivity of the sensor was determined to be 24.24 pm/g.
Conclusions:
- The developed FBG acceleration sensor meets the requirements for measuring low-frequency vibration signals.
- The sensor's design, incorporating a flexible hinge and symmetric compensation, enables effective low-frequency vibration detection.
- Experimental validation confirmed the sensor's performance within the specified operating parameters.
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