Fabrication and characterization of a non-zero dispersion-shifted mechanically-induced long-period grating for optical fiber sensing

2015 ◽  
Author(s):  
E. Gallegos-Arellano ◽  
R. I. Mata Chávez ◽  
E. Huerta-Mascotte ◽  
J. M. Estudillo-Ayala ◽  
A. D. Guzmán-Chávez ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Long Period Grating ◽  
Long Period ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Fabrication And Characterization

Characterization of optical fiber long period grating refractometer with nanocoating

2011 ◽  
Vol 153 (2) ◽  
pp. 335-339 ◽  
Author(s):  
E. Simões ◽  
I. Abe ◽  
J. Oliveira ◽  
O. Frazão ◽  
P. Caldas ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Long Period Grating ◽  
Long Period

scholarly journals Dynamic Responses Measured by Optical Fiber Sensor for Structural Health Monitoring

2019 ◽  
Vol 9 (15) ◽  
pp. 2956 ◽  
Author(s):  
Shiuh-Chuan Her ◽  
Shin-Chieh Chung
Keyword(s):  
Optical Fiber ◽  
Dynamic Strain ◽  
Fiber Grating ◽  
Base Excitation ◽  
Long Period ◽  
Fiber Sensing ◽  
Fbg Sensor ◽  
Sensing System ◽  
Optical Fiber Sensing ◽  
Period Fiber Grating

An optical fiber sensing system integrating a fiber Bragg grating (FBG) sensor, a long-period fiber grating (LPFG) optical filter and a photodetector is presented to monitor the dynamic response of a structure subjected to base excitation and impact loading. The FBG sensor is attached to a test specimen and connected to an LPFG filter. As the light reflected from the FBG sensor is transmitted through the long-period fiber grating filter, the intensity of the light is modulated by the wavelength, which is affected by the strain of the FBG. By measuring the intensity of the light using a photodetector, the wavelength reflected from the FBG sensor can be demodulated, thus leading to the determination of the strain in the structure. To demonstrate its effectiveness, the proposed sensing system was employed to measure the dynamic strain of a beam subjected to mechanical testing. The mechanical tests comprised three load scenarios: base excitation by a shaker at resonant frequency, impact loading by a hammer and shock test on a drop table. To monitor the dynamic strain during the test and validate the accuracy of the measurement of the FBG sensor, strain gauge was used as reference. Experimental results show good correlation between the measurements of FBG sensor and strain gauge. The present work provides a fast response and easy-to-implement optical fiber sensing system for structural health monitoring based on real-time dynamic strain measurements.

Characterization of concrete shrinkage induced strains in internally-restrained RC structures by distributed optical fiber sensing

2021 ◽  
Vol 120 ◽  
pp. 104058
Author(s):  
Mattia Francesco Bado ◽  
Joan R. Casas ◽  
Alinda Dey ◽  
Carlos G. Berrocal ◽  
Gintaris Kaklauskas ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Rc Structures ◽  
Concrete Shrinkage ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Distributed Optical Fiber
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