Abstract
The fiber Bragg grating (FBG) sensor, which was developed over recent decades, has been widely used to measure manifold static measurands in a variety of industrial sectors. Multiple experiments have demonstrated its ability in ultrasonic detection and its potential in ultrasonic structural health monitoring. Unlike static measurements, ultrasonic detection requires a higher sensitivity and broader bandwidth to ensure the fidelity of the ultrasonic Lamb wave that propagates in a plate-like structure for the subsequent waveform analysis. Thus, the FBG sensor head and its corresponding demodulation system need to be carefully designed, and other practical issues, such as the installation methods and data process methods, should also be properly addressed. In this review, the mature techniques of FBG-based ultrasonic sensors and their practical applications in ultrasonic structural health monitoring are discussed. In addition, state-of-the-art techniques are introduced to fully present the current developments.
Highlights
The health status of a structure such as an aerospace structure is always of concern to users because an initially small defect in a material may grow into large damage and lead to the catastrophic failure of the whole structure, which may even threaten people’s lives
This review summarizes the currently available fiber Bragg grating (FBG)-based ultrasonic detection techniques and introduces their applications in ultrasonic structural health monitoring (SHM)
Because the acoustic emission (AE) signal from transverse crack has the smallest energy among all the damage types of carbon fiber reinforced plastics (CFRPs), this research demonstrates the ability of the phase-shifted FBG (PSFBG)-based ultrasonic sensor in AE detection
Summary
The health status of a structure such as an aerospace structure is always of concern to users because an initially small defect in a material may grow into large damage and lead to the catastrophic failure of the whole structure, which may even threaten people’s lives. Many optical-fiber-based ultrasonic SHM techniques are being increasingly researched utilized. Many practical issues should be head comprehensively researched detect ultrasonic and solids if the sensor and the corresponding and carefully addressed for properly specific ultrasonic techniques. FBG-based dynamic sensing solutions available on the SHM market, as summarized comprehensively researched and carefully addressed for specific ultrasonic techniques. It is timely and imperative to review are applicable for acousto-ultrasonic detection, its performance to acoustic emission (AE) detection, the state-of-the-art techniquesand andcrucial to develop new techniques for FBG-based ultrasonic a much more demanding application, is questionable. This review summarizes the currently available FBG-based ultrasonic detection techniques and introduces their applications in ultrasonic SHM.
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