Journal ArticleDOI
Hybrid fiber Bragg grating/long period fiber grating sensor for strain/temperature discrimination
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TLDR
In this paper, the difference in strain and temperature response of fiber Bragg gratings and a long period fiber grating was used to discriminate between strain induced and temperature induced wavelength shifts.Abstract:
We demonstrate a novel sensor which uses the difference in strain and temperature response of fiber Bragg gratings and a long period fiber grating to discriminate between strain and temperature induced wavelength shifts. Sensor interrogation is performed entirely on the fiber Bragg grating reflection signals. Strain and temperature were simultaneously measured to /spl plusmn/9 /spl mu/strain and /spl plusmn/1.5/spl deg/C over a wide range of conditions.read more
Citations
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Journal ArticleDOI
Long-Period Fiber Grating Analysis Using Generalized N×N Coupled-Mode Theory by Section-Wise Discretization
Yoonchan Jeong,Byoungho Lee +1 more
TL;DR: For the precise analysis and design of LPFG's, a new method of generalized N $\times$ N coupled-mode theory by section-wise discretization was proposed in this article.
Journal ArticleDOI
Long-Period Gratings Dynamic Interrogation With Modulated Fiber Bragg Gratings and Optical Amplification
J. P. Carvalho,Luis Coelho,Maria José Pontes,Andrés Pablo López Barbero,M. A. G. Martinez,Ricardo M. Ribeiro,J. Weyl,José Baptista,Maria Thereza M. Rocco Giraldi,I. Dias,Jose Luis Santos,Orlando Frazão +11 more
TL;DR: In this article, a long-period grating (LPG) dynamic interrogation technique based on the modulation of fiber Bragg gratings located in the readout unit of the system was proposed.
Proceedings ArticleDOI
Simultaneous measurement of strain and temperature using a fiber Bragg grating and a thermochromic material
TL;DR: In this article, a new scheme for simultaneous measurement of temperature and strain using fiber Bragg grating (FBG) has been presented, which uses a FBG and a thermochromic material attached at the end of the same fiber pigtail; the first one measures the strain and the second one measures temperature and correct the information of the FBG.
Proceedings ArticleDOI
Refractive index sensor for liquids and solids using dielectric multilayer films deposited on optical fiber end surface
TL;DR: In this article, a fiber-optic refractive index (RI) sensor using dielectric multilayer thin films (DMFs) deposited on an optical fiber end surface, which rejects the incident light with particular wavelength.
Journal Article
Distributed and Multiplexed Fibre Grating Sensors, Including Discussion of Problem Areas
J.P. Dakin,M. Volanthen +1 more
TL;DR: A short review of distributed and multiplexed sensor technology based on fiber gratings is given in this article, followed by details of more specific work in this area at the University of Southampton.
References
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Journal ArticleDOI
Formation of Bragg gratings in optical fibers by a transverse holographic method
G. Meltz,W W Morey,W. H. Glenn +2 more
TL;DR: Bragg gratings have been produced in germanosilicate optical fibers by exposing the core, through the side of the cladding, to a coherent UV two-beam interference pattern with a wavelength selected to lie in the oxygen-vacancy defect band of germania, near 244 nm.
Long-period fiber grating as band-rejection filters
TL;DR: In this paper, a new class of long-period fiber gratings that can be used as in-fiber, low-loss, band-rejection filters is presented.
Journal ArticleDOI
Long-period fiber gratings as band-rejection filters
Ashish Madhukar Vengsarkar,Paul Joseph Lemaire,J. B. Judkins,Vikram Bhatia,Turan Erdogan,John E. Sipe +5 more
TL;DR: In this paper, a new class of long-period fiber gratings that can be used as in-fiber, low-loss, band-rejection filters is presented.
Journal ArticleDOI
Multiplexed fiber Bragg grating strain-sensor system with a fiber Fabry–Perot wavelength filter
TL;DR: The use of a fiber Fabry–Perot filter for detecting the wavelength shift of a Fiber Bragg grating sensor or network of sensor elements along a common fiber path is described.
Journal ArticleDOI
Discrimination between strain and temperature effects using dual-wavelength fibre grating sensors
TL;DR: In this paper, the spectral properties of two superimposed fiber gratings having different Bragg wavelengths (850 and 1300 nm) with respect to strain and temperature were studied, and it was shown that the ratio of sensitivity at two Bragg wavelength is dependent on strain, which can be used for simultaneous measurement of these parameters.