Factors influencing the temperature sensitivity of PMMA based optical fiber Bragg gratings

This study investigates the influence of lay-up and load direction on embedded optical fiber Bragg gratings (FBGs) used as strain sensors. FBGs have shown great promise for application to structural health monitoring with advantages of small size and cylindrical geometry readily allowing for embedment within fiber reinforced composites. Characterization of the embedded FBGs is necessary to develop a rugged and reliable strain sensor. This paper specifically explores the effects of loading direction on the FBG strain outputs. A well behaved baseline case is established with results for gratings loaded parallel to the optical fiber direction while embedded parallel to the adjacent structural fibers in a quasi-isotropic composite. Results and analysis are also presented for a case involving a composite fabricated with the optical and structural fibers parallel to each other but perpendicular to the loading direction. Extremely good results are obtained relating FBG strain measurements with that of surface mounted resistance strain gauges.

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Temperature Sensing in Hyperthermia Study in Breast Cancer Treatment Using Optical Fiber Bragg Gratings

Communications in Computer and Information Science - Applied Informatics ◽

10.1007/978-3-030-61702-8_32 ◽

2020 ◽

pp. 467-478

Author(s):

Andrés Triana ◽

C. Camilo Cano ◽

Hector F. Guarnizo-Mendez ◽

Mauricio A. Poloche

Keyword(s):

Breast Cancer ◽

Optical Fiber ◽

Cancer Treatment ◽

Fiber Bragg Gratings ◽

Bragg Gratings ◽

Breast Cancer Treatment ◽

Temperature Sensing

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Multimode optical fiber Bragg gratings: modeling, simulation, and experiments

10.1117/12.567283 ◽

2004 ◽

Author(s):

Jinsong Zhang ◽

Honggang Yu ◽

Chang-Qing Xu ◽

Wei-Ping Huang

Keyword(s):

Optical Fiber ◽

Fiber Bragg Gratings ◽

Bragg Gratings ◽

Multimode Optical Fiber ◽

Modeling Simulation

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Quantitative morphology of femtosecond laser-written point-by-point optical fiber Bragg gratings

Optics Letters ◽

10.1364/ol.441813 ◽

2021 ◽

Author(s):

Saurabh Bhardwaj ◽

Toney Fernandez ◽

Simon Gross ◽

Michael Withford ◽

Michael Steel

Keyword(s):

Femtosecond Laser ◽

Optical Fiber ◽

Fiber Bragg Gratings ◽

Bragg Gratings ◽

Quantitative Morphology

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Numerical Analysis of Thermal Dependence of the Spectral Response of Polymer Optical Fiber Bragg Gratings

Iraqi Journal for Electrical And Electronic Engineering ◽

10.37917/ijeee.12.1.9 ◽

2016 ◽

Vol 12 (1) ◽

pp. 85-95 ◽

Cited By ~ 1

Author(s):

Hisham Hisham

Keyword(s):

Optical Fiber ◽

High Stability ◽

Spectral Response ◽

Fiber Bragg Gratings ◽

Bragg Gratings ◽

Bragg Reflector ◽

Polymer Optical Fiber ◽

Thermal Dependence ◽

Silica Optical Fiber ◽

Index Modulation

The thermal dependence of the spectral response (i.e. transmission, reflection and time delay ( r) responses) of uniform polymer optical fiber (POF) Bragg gratings has been investigated. In addition to the temperature dependence, the effects of grating strength (kLg) and fiber index modulation ( n) have been investigated. Besides high capability of tunable wavelength due to the unique large and negative thermo-optic coefficient of POF, the spectral response for POF Bragg gratings show high stability and larger spectrum bandwidth with temperature variation compare with the silica optical fiber (SOF) Bragg gratings, especially with the increase of the kLg value. It was found that by increasing kLg, the peak reflectance value increases and the bandwidth of the Bragg reflector become narrower. Also it’s shown by increasing the kLg value, r deceasing significantly and reach its minimum value at the designed wavelength ( B). Furthermore, the r for POF Bragg gratings is less than that for SOF Bragg gratings at the same value of kLg. Also it’s found that the peak reflectivity value increases to around 60% when the n value increases from 1*10-4 to 5*10-4.

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