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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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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
Summary
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.
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.
