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Optical Fiber Sensors for Ultrasonic Structural Health Monitoring: A Review.

Rohan Soman¹, Junghyun Wee², Kara Peters²

¹Institute of Fluid Flow Machinery, Polish Academy of Science, 80-231 Gdansk, Poland.

Sensors (Basel, Switzerland)

|November 13, 2021

Summary

This summary is machine-generated.

Optical fiber sensors, particularly Fiber Bragg Grating (FBG) sensors, are ideal for structural health monitoring (SHM) using guided waves (GW) and acoustic emission (AE). This review details their ultrasonic sensing capabilities and future trends.

Keywords:

acoustic emission fiber optic sensors guided waves structural health monitoring ultrasonic

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Area of Science:

Materials Science and Engineering
Mechanical Engineering
Sensor Technology

Background:

Structural Health Monitoring (SHM) utilizes guided waves (GW) and acoustic emission (AE) for comprehensive structure assessment with minimal sensors.
Optical fiber sensors are highly suitable for SHM due to their lightweight, embeddable nature, and electromagnetic interference immunity.

Purpose of the Study:

To review various optical fiber technologies for ultrasonic sensing in SHM.
To focus on advancements in Fiber Bragg Grating (FBG) sensors for ultrasonic measurements, highlighting their promise and widespread use.
To discuss wave coupling physics, directional sensitivity, and coupling phenomena in optical fibers.

Main Methods:

Comprehensive review of existing literature on optical fiber-based ultrasonic sensing for SHM.
Detailed discussion of different optical fiber technologies, with emphasis on FBG sensors.
Analysis of the physical principles governing wave interaction with optical fibers.

Main Results:

FBG sensors are identified as a highly promising and widely adopted technology for ultrasonic sensing in SHM.
The review elucidates the physics of wave coupling to optical fibers, including directional sensitivity and coupling effects.
Real-world applications of various optical fiber sensors in SHM are presented and discussed.

Conclusions:

Optical fiber sensors, especially FBG, represent an advanced solution for SHM applications.
Understanding wave coupling phenomena is crucial for optimizing sensor performance.
The field shows encouraging trends and identifies key areas for future development in optical fiber-based SHM.