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Related Experiment Video

Updated: Jul 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

Pointwise fiber Bragg grating displacement sensor system for dynamic measurements.

Kuo-Chih Chuang¹, Chien-Ching Ma

¹Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 106, China.

|July 12, 2008

Summary

A novel fiber Bragg grating (FBG) sensor can measure dynamic displacement in or out-of-plane with high sensitivity. This reusable sensor system demonstrates reliable performance in dynamic motion and impact testing up to 20 kHz.

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Area of Science:

Optoelectronics
Fiber Optic Sensors
Mechanical Engineering

Background:

Accurate measurement of dynamic displacement is crucial in various engineering applications.
Existing methods for dynamic displacement sensing face limitations in sensitivity, reusability, or measurement range.
Fiber Bragg Grating (FBG) sensors offer potential for high-resolution, remote sensing applications.

Purpose of the Study:

To propose and validate a reusable fiber Bragg grating (FBG) sensor system for measuring pointwise, out-of-plane, and in-plane dynamic displacement.
To demonstrate the sensor's capability using a multiplexing demodulation system based on a single long-period fiber grating.
To assess the sensor's performance in characterizing dynamic responses of mechanical structures.

Main Methods:

Related Experiment Videos

Last Updated: Jul 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

Development of a reusable fiber Bragg grating (FBG) sensor setup.
Implementation of a multiplexing demodulation system utilizing a single long-period fiber grating.
Experimental validation using a multilayer piezoelectric actuator for steady-state motion and a cantilever beam under impact loading.
High-frequency excitation of a piezoceramic plate to evaluate in-plane displacement measurement.

Main Results:

The proposed FBG sensor system successfully measured out-of-plane dynamic displacement with high sensitivity.
The sensor demonstrated the ability to measure in-plane dynamic displacement up to 20 kHz.
Experimental results confirmed the sensor's effectiveness in characterizing dynamic responses of actuators and beams.

Conclusions:

The developed FBG sensor system provides a sensitive and reusable solution for dynamic displacement measurement.
The system is capable of measuring both out-of-plane and in-plane dynamic displacements across a significant frequency range.
This technology holds promise for advanced structural health monitoring and dynamic analysis applications.