Dynamic strain monitoring by wavelength locking between two fiber Bragg gratings fiber sensing system

2008 ◽  
Vol 46 (7) ◽  
pp. 546-549 ◽  
Author(s):  
Ming Chang Shih ◽  
C.L. Ko ◽  
C.Y. Yang
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Dynamic Strain ◽  
Fiber Sensing ◽  
Sensing System ◽  
Strain Monitoring

Study of a Quasi-Distributed Optical Fiber Sensing System Based on Ultra-Weak Fiber Bragg Gratings

2014 ◽  
Vol 41 (4) ◽  
pp. 0405004 ◽  
Author(s):  
张彩霞 Zhang Caixia ◽  
张震伟 Zhang Zhenwei ◽  
郑万福 Zheng Wanfu ◽  
刘晓航 Liu Xiaohang ◽  
李裔 Li Yi ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Fiber Sensing ◽  
Sensing System ◽  
Optical Fiber Sensing ◽  
Distributed Optical Fiber

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.

scholarly journals Tactile Sensor Array with Fiber Bragg Gratings in Quasi-Distributed Sensing

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Marcelo A. Pedroso ◽  
Lucas H. Negri ◽  
Marcos A. Kamizi ◽  
José L. Fabris ◽  
Marcia Muller
Keyword(s):  
Differential Evolution ◽  
Compressive Sensing ◽  
Sensor Array ◽  
Fiber Bragg Gratings ◽  
Tactile Sensor ◽  
Bragg Gratings ◽  
Central Position ◽  
Reconstruction Method ◽  
Sensing System ◽  
Tactile Sensor Array

This work describes the development of a quasi-distributed real-time tactile sensing system with a reduced number of fiber Bragg grating-based sensors and reports its use with a reconstruction method based on differential evolution. The sensing system is comprised of six fiber Bragg gratings encapsulated in silicone elastomer to form a tactile sensor array with total dimensions of 60 × 80 mm, divided into eight sensing cells with dimensions of 20 × 30 mm. Forces applied at the central position of the sensor array resulted in linear response curves for the gratings, highlighting their coupled responses and allowing the application of compressive sensing. The reduced number of sensors regarding the number of sensing cells results in an undetermined inverse problem, solved with a compressive sensing algorithm with the aid of differential evolution method. The system is capable of identifying and quantifying up to four different loads at four different cells with relative errors lower than 10.5% and signal-to-noise ratio better than 12 dB.

Evaluation electromagnetic contactor magnetic core temperature and dynamic strain using fiber Bragg gratings

Measurement ◽  
2020 ◽  
Vol 166 ◽  
pp. 108174
Author(s):  
Cesar Caytuiro Tapia ◽  
Jorge Luis Roel Ortiz ◽  
Uilian José Dreyer ◽  
Jean Carlos Cardozo da Silva ◽  
Kleiton de Morais Sousa
Keyword(s):  
Core Temperature ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Magnetic Core ◽  
Dynamic Strain
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