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Related Experiment Video

Updated: May 3, 2026

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 non-contact fiber Bragg grating vibration sensor.

Tianliang Li¹, Yuegang Tan¹, Li Wei¹

¹School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, Hubei, China.

The Review of Scientific Instruments

|February 13, 2014

Summary

This summary is machine-generated.

This study introduces a novel non-contact vibration sensor using fiber Bragg grating (FBG) technology. The FBG sensor accurately measures rotating shaft vibrations without physical contact, demonstrating reliable performance in experimental analysis.

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Area of Science:

Optical Sensing
Mechanical Engineering
Materials Science

Background:

Traditional vibration sensors often require physical contact, limiting their application in certain rotating machinery.
Non-contact methods are desirable for monitoring shaft dynamics to prevent interference and ensure safety.

Purpose of the Study:

To propose and analyze a non-contact vibration sensor utilizing Fiber Bragg Grating (FBG) technology.
To investigate the principle, simulation, and experimental validation of the FBG-based sensor for rotating shaft vibration measurement.

Main Methods:

The sensor employs magnetic coupling to deform a diaphragm connected to an FBG.
Changes in the FBG's center wavelength, caused by diaphragm deformation, correlate to shaft vibration displacement.
Simulation and experimental analyses were conducted to evaluate sensor performance.

Main Results:

The sensor exhibits a resonant frequency of approximately 1500 Hz and a working bandwidth of 0-1300 Hz.
Experimental results show a sensitivity of -1.694 pm/μm and linearity of 2.92% within a 2-2.4 mm range.
Simulation results are consistent with experimental findings.

Conclusions:

The developed FBG-based sensor enables effective non-contact measurement of rotating shaft vibrations.
The sensor demonstrates good accuracy, linearity, and a suitable working frequency range for practical applications.
This technology offers a promising solution for condition monitoring in rotating machinery.