Demodulation of a weak fiber Bragg grating array using a fiber delay line

2020 ◽  
Vol 59 (8) ◽  
pp. 2325
Author(s):  
Peng Ding ◽  
Wen Liu ◽  
Hongcan Gu ◽  
Yunyun Wang ◽  
Jing Wu ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Delay Line ◽  
Bragg Grating ◽  
Fiber Delay Line ◽  
Grating Array

Recirculating fiber delay-line filter with a fiber Bragg grating

1998 ◽  
Vol 37 (23) ◽  
pp. 5469 ◽  
Author(s):  
Sungchul Kim ◽  
Byoungho Lee
Keyword(s):  
Fiber Bragg Grating ◽  
Delay Line ◽  
Bragg Grating ◽  
Fiber Delay Line

Online reflectivity measurement of an ultra-weak fiber Bragg grating array

2013 ◽  
Vol 24 (10) ◽  
pp. 105102 ◽  
Author(s):  
Zhihui Luo ◽  
Hongqiao Wen ◽  
Xiaofu Li ◽  
Huiyong Guo
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Reflectivity Measurement ◽  
Grating Array

scholarly journals Phase sensitive distributed vibration sensing based on ultraweak fiber Bragg grating array using double-pulse

2017 ◽  
Vol 56 (08) ◽  
pp. 1 ◽  
Author(s):  
Tao Liu ◽  
Feng Wang ◽  
Xuping Zhang ◽  
Lin Zhang ◽  
Quan Yuan ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Double Pulse ◽  
Bragg Grating ◽  
Vibration Sensing ◽  
Phase Sensitive ◽  
Grating Array

Damage localization with fiber Bragg grating Lamb wave sensing through adaptive phased array imaging

2018 ◽  
Vol 18 (1) ◽  
pp. 334-344 ◽  
Author(s):  
Zhenhua Tian ◽  
Lingyu Yu ◽  
Xiaoyi Sun ◽  
Bin Lin
Keyword(s):  
Fiber Bragg Grating ◽  
Electromagnetic Interference ◽  
Lamb Wave ◽  
Phased Array ◽  
Minimum Variance ◽  
Bragg Grating ◽  
Damage Localization ◽  
Weighting Factors ◽  
Wave Imaging ◽  
Grating Array

Fiber Bragg gratings are known being immune to electromagnetic interference and emerging as Lamb wave sensors for structural health monitoring of plate-like structures. However, their application for damage localization in large areas has been limited by their direction-dependent sensor factor. This article addresses such a challenge and presents a robust damage localization method for fiber Bragg grating Lamb wave sensing through the implementation of adaptive phased array algorithms. A compact linear fiber Bragg grating phased array is configured by uniformly distributing the fiber Bragg grating sensors along a straight line and axially in parallel to each other. The Lamb wave imaging is then performed by phased array algorithms without weighting factors (conventional delay-and-sum) and with adaptive weighting factors (minimum variance). The properties of both imaging algorithms, as well as the effects of fiber Bragg grating’s direction-dependent sensor factor, are characterized, analyzed, and compared in details. The results show that this compact fiber Bragg grating array can precisely locate damage in plates, while the comparisons show that the minimum variance method has a better imaging resolution than that of the delay-and-sum method and is barely affected by fiber Bragg grating’s direction-dependent sensor factor. Laboratory tests are also performed with a four–fiber Bragg grating array to detect simulated defects at different directions. Both delay-and-sum and minimum variance methods can successfully locate defects at different positions, and their results are consistent with analytical predictions.

Monitoring system of railway track based on identity weak fiber Bragg grating array

2019 ◽  
Vol 48 (6) ◽  
pp. 622001
Author(s):  
张 翠 Zhang Cui ◽  
陶 渊 Tao Yuan ◽  
童杏林 Tong Xinglin ◽  
邓承伟 Deng Chengwei ◽  
何 为 He Wei ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Monitoring System ◽  
Railway Track ◽  
Bragg Grating ◽  
Grating Array
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