scholarly journals A multi-channel real-time detection method for tunnel boring machine cutter wear based on Chirped Fiber Bragg Gratings

AIP Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 015312
Author(s):  
Jin Wang ◽  
Wanshan Zhu ◽  
Lei Jiang ◽  
Junfeng Jiang ◽  
Tiegen Liu
Keyword(s):  
Real Time ◽  
Detection Method ◽  
Fiber Bragg Gratings ◽  
Tunnel Boring Machine ◽  
Bragg Gratings ◽  
Tunnel Boring ◽  
Cutter Wear ◽  
Real Time Detection ◽  
Chirped Fiber Bragg Gratings

scholarly journals Bi-Dimensional Deflection Estimation by Embedded Fiber Bragg Gratings Sensors

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 3
Author(s):  
Palma ◽  
Palumbo ◽  
Pietra ◽  
Canale ◽  
Alviggi ◽  
...  
Keyword(s):  
Real Time ◽  
Fiber Bragg Gratings ◽  
Beam Theory ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Structural Monitoring ◽  
Direct Measure ◽  
Large Structure ◽  
Good Agreement ◽  
Classical Beam Theory

In this work, we present and discuss on the deflection estimation of a bi-dimensional panel by using Fiber Bragg Gratings (FBGs) as strain sensors embedded in the structure and a method based on the classical beam theory. The existing difficulties in the direct measure of the deflection are overcome thanks to the proposed technique and a real-time indirect structural monitoring is possible both on small and large structure. In many tests the estimated deflection with the proposed method has been compared with direct deflection measurements obtained with a mechanical comparator showing good agreement. A resolution of few tens of microns over a surface of the order of 1 m2 has been reached.

CGH-based real-time analysis of fiber Bragg gratings in few mode LMA fibers

2012 ◽  
Author(s):  
Markus Mundus ◽  
Jens U. Thomas ◽  
Christian Voigtländer ◽  
Ria G. Becker ◽  
Cesar Jauregui ◽  
...  
Keyword(s):  
Real Time ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Time Analysis ◽  
Real Time Analysis

scholarly journals Fabrication and Analysis of Chirped Fiber Bragg Gratings by Thermal Diffusion

ETRI Journal ◽  
2004 ◽  
Vol 26 (4) ◽  
pp. 371-374 ◽  
Author(s):  
Seung-Hyun Cho ◽  
Jaedong Park ◽  
Byoungwhi Kim ◽  
Min-Ho Kang
Keyword(s):  
Thermal Diffusion ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Chirped Fiber Bragg Gratings

Structured Chirped Fiber Bragg Gratings

2008 ◽  
Vol 26 (12) ◽  
pp. 1613-1625 ◽  
Author(s):  
Marco Pisco ◽  
Agostino Iadicicco ◽  
Stefania Campopiano ◽  
Antonello Cutolo ◽  
Andrea Cusano
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Chirped Fiber Bragg Gratings

Impact of apodisation functions on group delay and reflectivity ripple of chirped fiber Bragg gratings

2006 ◽  
Vol 2 (6) ◽  
pp. 430-432
Author(s):  
Lin Wang ◽  
Feng-ping Yan ◽  
Yi-fan Li ◽  
Tao-rong Gong ◽  
Shui-sheng Jian
Keyword(s):  
Group Delay ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Chirped Fiber Bragg Gratings

scholarly journals Recent Achievements on Grating Fabrications in Polymer Optical Fibers with Photosensitive Dopants: A Review

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 273
Author(s):  
Jie Jiang ◽  
Nan Zhang ◽  
Rui Min ◽  
Xin Cheng ◽  
Hang Qu ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Refractive Index Change ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Fiber Gratings ◽  
Comprehensive Overview ◽  
Broad Perspective ◽  
Long Period Fiber Gratings ◽  
Polymer Optical Fibers ◽  
Chirped Fiber Bragg Gratings

This review discusses recent achievements on grating fabrications in polymer optical fibers doped with photosensitive materials. First, different photosensitive dopants in polymer optical fibers (POFs) are summarized, and their refractive index change mechanisms are discussed. Then, several different doping methods to fabricate the photosensitive POFs are presented. Following that, the principles of gratings, including standard fiber Bragg gratings (FBGs), tilted fiber Bragg gratings (TFBGs), chirped fiber Bragg gratings (CFBGs), phase-shifted fiber Bragg gratings (PSFBGs), and long period fiber gratings (LPFGs), are reported. Finally, fabrications of different gratings based on photosensitive POFs in the last 20 years are reported. We present our article clearly and logically, so that it will be helpful for researchers to explore a broad perspective on this proposed topic. Overall, the content provides a comprehensive overview of photosensitive POF fabrications and grating inscriptions in photosensitive POFs, including previous breakthroughs and recent advancements.

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