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Related Experiment Video

Updated: Oct 20, 2025

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

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

Published on: September 30, 2019

A multi-cantilever beam low-frequency FBG acceleration sensor.

Li Hong^1,2, Rui Sun^1,2, Zhongchao Qiu^3,4,5

¹Institute of Disaster Prevention, School of Electronic Science and Control Engineering, Sanhe, 065201, Hebei, China.

Scientific Reports

|September 17, 2021

Summary

This summary is machine-generated.

A novel multi-cantilever beam Fiber Bragg Grating (FBG) acceleration sensor enhances low-frequency vibration monitoring. This new design significantly improves sensitivity and accuracy for applications in seismology and structural health monitoring.

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Area of Science:

Mechanical Engineering
Sensor Technology
Optical Sensing

Background:

Low-frequency vibration signals (2-50 Hz) are crucial for engineering seismology, bridge monitoring, and oil/gas exploration.
Existing Fiber Bragg Grating (FBG) acceleration sensors suffer from low sensitivity in low-frequency measurements.
There is a need for improved sensor technology to accurately capture subtle low-frequency vibrations.

Purpose of the Study:

To propose and develop a novel multi-cantilever beam FBG acceleration sensor.
To enhance sensitivity and reduce transverse crosstalk for low-frequency vibration measurement.
To validate the sensor's performance through simulation and experimental testing.

Main Methods:

Sensor design and structural parameter optimization using ANSYS software.
Fabrication of a multi-cantilever beam sensor with three beams arranged at 120° around a mass block.
Performance evaluation including natural frequency, sensitivity, linearity, transverse interference immunity, and dynamic range testing.

Main Results:

The developed sensor has a natural frequency of approximately 64 Hz.
It is effective for monitoring low-frequency vibrations in the 16-54 Hz range.
Achieved high linearity (>99%), low transverse interference (<2.58%), and a wide dynamic range (86 dB).

Conclusions:

The multi-cantilever beam FBG acceleration sensor effectively addresses the low sensitivity issue in low-frequency measurements.
The optimized design improves sensitivity and transverse interference immunity.
The findings provide valuable insights for developing similar sensors and advancing fiber optic acceleration sensing technology.