Damage evaluation of complex composite structures using acousto-ultrasonic detection combined with phase-shifted fiber Bragg grating and dual-frequency based data processing

2021 ◽  
pp. 115000
Author(s):  
Hanqi Zhang ◽  
Qi Wu ◽  
Wuke Xu ◽  
Ke Xiong
Keyword(s):  
Data Processing ◽  
Fiber Bragg Grating ◽  
Composite Structures ◽  
Bragg Grating ◽  
Damage Evaluation ◽  
Dual Frequency ◽  
Ultrasonic Detection

Health Monitoring of Composite Material Using Fiber Bragg Grating

2012 ◽  
Author(s):  
S. J. Fattahi ◽  
D. Necsulescu
Keyword(s):  
Composite Materials ◽  
Fiber Bragg Grating ◽  
Health Monitoring ◽  
Composite Structures ◽  
Rapid Development ◽  
Bragg Grating ◽  
Stress And Strain ◽  
Layered Composites ◽  
Large Size ◽  
Applied Forces

Recently, the use of composite materials in different applications like aircrafts, wind turbines and towers has developed rapidly. This rapid development of large size composite structures is, though, not without its problems, particularly in case of difference in lamination when using various materials. Health monitoring and delaminating preventive maintenance are important issues when using composite materials. The use of smart structures enables real-time monitoring of the composite materials and permits applications using sensors to appropriately arrive to a desired state. This paper presents an optimal, inexpensive and continuous laminated sensor based monitoring in composites using Fiber Bragg Grating (FBG). This paper investigates layered composites and FEM based on the static and dynamic equations and the mechanical behavior with respect to stress and strain. Delaminating criteria of a composite cantilever beam can be analyzed based on wavelength shifting relations of FBG and in the resulting reflected spectrum caused by applied forces or displacements.

scholarly journals Ultrasonic Structural Health Monitoring Using Fiber Bragg Grating

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3395 ◽  
Author(s):  
Qi Wu ◽  
Yoji Okabe ◽  
Fengming Yu
Keyword(s):  
Structural Health Monitoring ◽  
Fiber Bragg Grating ◽  
Health Monitoring ◽  
Waveform Analysis ◽  
Bragg Grating ◽  
Ultrasonic Detection ◽  
Practical Applications ◽  
Structural Health ◽  
Fbg Sensor ◽  
Industrial Sectors

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.

Fiber Bragg grating based displacement sensors: state of the art and trends

Sensor Review ◽  
2019 ◽  
Vol 39 (1) ◽  
pp. 87-98 ◽  
Author(s):  
Wenlong Liu ◽  
Yongxing Guo ◽  
Li Xiong ◽  
Yi Kuang
Keyword(s):  
Fiber Bragg Grating ◽  
Composite Structures ◽  
Structure Design ◽  
Bragg Grating ◽  
Content Type ◽  
Displacement Sensors ◽  
Special Fibers ◽  
Beam Type ◽  
Information Detection ◽  
Wavelength Detection

Purpose The purpose of this paper is to present the latest sensing structure designs and principles of information detection of fiber Bragg grating (FBG) displacement sensors. Research advance and the future work in this field have been described, with the background that displacement and deformation measurements are universal and crucial for structural health monitoring. Design/methodology/approach This paper analyzes and summarizes the existing FBG displacement sensing technologies from two aspects principle of information detection (wavelength detection, spectral bandwidth detection, light intensity detection, among others) and principle of the sensing elastomer structure design (cantilever beam type, spring type, elastic ring type and other composite structures). Findings The current research on developing FBG displacement sensors is mainly focused on the sensing method, the construction and design of the elastic structure and the design of new information detection method. The authors hypothesize that the following research trends will be strengthened in future: temperature compensation technology for FBG displacement sensors based on wavelength detection; a study of more diverse elastic structures; and fiber gratings manufactured with special fibers will greatly improve the performance of sensors. Originality/value The latest sensing structure designs and principles of information detection of FBG displacement sensors have been proposed, which could provide important reference for research group.

Fiber Bragg grating spectral features for structural health monitoring of composite structures

2014 ◽  
Author(s):  
Sean Webb ◽  
Kara Peters ◽  
Mohammed Zikry ◽  
Nikola Stan ◽  
Spencer Chadderdon ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Fiber Bragg Grating ◽  
Health Monitoring ◽  
Composite Structures ◽  
Bragg Grating ◽  
Spectral Features ◽  
Structural Health
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