Experimental research on crack detection in pipes based on Fiber Bragg grating

2017 ◽  
Author(s):  
Lin Cai ◽  
Qin Wei ◽  
Zhaoxiang Yu ◽  
Ming Lu ◽  
Xiaowei Li
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental Research ◽  
Crack Detection ◽  
Bragg Grating

Experimental Research on Fiber Bragg Grating Based Monitor for Laser Thrombolysis in vitro

2009 ◽  
Vol 36 (4) ◽  
pp. 1020-1024
Author(s):  
陈哲敏 Chen Zhemin ◽  
陈军 Chen Jun ◽  
山下丰 Yamashita Yutaka ◽  
山下大浦 Yamashita Daisuke ◽  
清水良幸 Shimizhu Yoshiyuki
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental Research ◽  
Bragg Grating

scholarly journals Damage Detection in a Plate Structure based on FBG sensing Technique under a Single-Mode Lamb Wave

2018 ◽  
Vol 14 (07) ◽  
pp. 62
Author(s):  
Cai Li ◽  
Hunag Xiao ◽  
Zuo Xiaoqiong
Keyword(s):  
Damage Detection ◽  
Fiber Bragg Grating ◽  
Lamb Wave ◽  
Crack Detection ◽  
Simulation Analysis ◽  
Experimental System ◽  
Wave Structure ◽  
Single Mode ◽  
Bragg Grating ◽  
Wave Technique

Lamb wave is widely acknowledged as one of the most encouraging tools for damage identification in plate structures, and relevant research has been conducted intensively. However Lamb wave modes have different wave structure, frequency dispersion and attenuation characteristics, which are sensitivity to different types of damages and it is difficult to solve such engineering problems by conventional techniques. Although the single pattern detection method has been researched by piezoelectric wafers, there is little research about FBG sensing detection under single-mode ultrasonic Lamb wave technique currently. So this paper puts forward a single-mode Lamb wave technique for crack detection based on Fiber Bragg Grating sensor, which is used to receive the waves in the plate. First of all, measuring principle of single-mode ultrasonic Lamb technique and demodulation principle of the FBG sensor are introduced. And simulation analysis in the acoustic field is devoted, whose results lay the foundation for the damage detection in the plate. Then, the experimental system is built by a single-mode Lamb wave excitation, and the feasibility of fiber Bragg grating sensors in single-mode excitation method is verified by experiments.

Design and experimental research on cantilever accelerometer based on fiber Bragg grating

2016 ◽  
Vol 55 (6) ◽  
pp. 066113 ◽  
Author(s):  
Longhai Xiang ◽  
Qi Jiang ◽  
Yibin Li ◽  
Rui Song
Keyword(s):  
Fiber Bragg Grating ◽  
Experimental Research ◽  
Bragg Grating

scholarly journals Detection of Crack Initiation and Growth Using Fiber Bragg Grating Sensors Embedded into Metal Structures through Ultrasonic Additive Manufacturing

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4917 ◽  
Author(s):  
Sean K. Chilelli ◽  
John J. Schomer ◽  
Marcelo J. Dapino
Keyword(s):  
Additive Manufacturing ◽  
Crack Initiation ◽  
Fiber Bragg Grating ◽  
Health Monitoring ◽  
Crack Detection ◽  
Aluminum Matrix ◽  
Initiation Site ◽  
Bragg Grating ◽  
Ultrasonic Additive Manufacturing ◽  
Fbg Sensors

Structural health monitoring (SHM) is a rapidly growing field focused on detecting damage in complex systems before catastrophic failure occurs. Advanced sensor technologies are necessary to fully harness SHM in applications involving harsh or remote environments, life-critical systems, mass-production vehicles, robotic systems, and others. Fiber Bragg Grating (FBG) sensors are attractive for in-situ health monitoring due to their resistance to electromagnetic noise, ability to be multiplexed, and accurate real-time operation. Ultrasonic additive manufacturing (UAM) has been demonstrated for solid-state fabrication of 3D structures with embedded FBG sensors. In this paper, UAM-embedded FBG sensors are investigated with a focus on SHM applications. FBG sensors embedded in an aluminum matrix 3 mm from the initiation site are shown to resolve a minimum crack length of 0.286 ± 0.033 mm and track crack growth until near failure. Accurate crack detection is also demonstrated from FBGs placed 6 mm and 9 mm from the crack initiation site. Regular acrylate-coated FBG sensors are shown to repeatably work at temperatures up to 300 ∘ C once embedded with the UAM process.

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