scholarly journals In-situ strain measurements in composites during fatigue testing using optical fiber Bragg gratings and a portable CCD detection system

1996 ◽  
Author(s):  
Tonguy Liu ◽  
Gerard F. Fernando ◽  
Yun-Jiang Rao ◽  
David A. Jackson ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fatigue Testing ◽  
Detection System ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Strain Measurements

scholarly journals Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

2010 ◽  
Vol 18 (25) ◽  
pp. 26484 ◽  
Author(s):  
Dragan Coric ◽  
Marco Lai ◽  
John Botsis ◽  
Aiping Luo ◽  
Hans G. Limberger
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Small Diameter ◽  
Bragg Gratings ◽  
Strain Measurements ◽  
Low Coherence ◽  
Distributed Strain

Cyclodextrin-Based Supramolecular Multilayer Assemblies for the Design of Biological Optical Sensors Using Tilted Fiber Bragg Gratings

2011 ◽  
Vol 495 ◽  
pp. 45-48 ◽  
Author(s):  
Sandrine Lépinay ◽  
Guillaume Laffont ◽  
Giséle Volet ◽  
Véronique Wintgens ◽  
Pierre Ferdinand ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Serum Albumin ◽  
Real Time ◽  
Optical Sensors ◽  
Detection System ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Hydroxyl Groups ◽  
Layer By Layer ◽  
Assembly Method

In this work, we demonstrate the possibility to use optical fiber incorporating photowritten tilted fiber Bragg gratings (TFBG) as optical detection system for the real time monitoring of interfacial adsorption events and biological recognition. For this purpose, immobilization of cyclodextrin polymers onto the surface of optical fiber was envisioned through the layer-by-layer self-assembly method with the aim of developing sensing layers with well-defined host properties. To develop a biological sensor, amphiphilic dextran, acting as intermediate layer between the polyelectrolyte multilayer assembly and the biological probe, was immobilized though inclusion complex formation. The dextran layer exhibit a dual functionality: (i) it prevents non-specific proteins adsorption and (ii) it allows covalent immobilization of anti-bovine serum albumine through activation of the hydroxyl groups with 1,1’-carbonyl diimidazole. To verify the feasibility of our strategy, fluorescence microscopy was applied to evidence the effective inclusion of fluorescent macromolecular – flurorescein labelled dextran bearing adamantane as side-grafts – species within the cyclodextrin cavities present onto the optical fiber interface and at the last layer to prove the grafting of anti bovin serum albumin onto the amphiphilic dextran by a capture of fluorescein bovin serum albumin by the antibody layer. In a further step, it was demonstrated that the elaboration of the multilayer assembly can be monitored in real time using the TFBG sensor.

Cyclodextrin-Based Supramolecular Multilayer Assemblies for the Design of Chemical Optical Sensors Using Tilted Fiber Bragg Gratings

2011 ◽  
Vol 495 ◽  
pp. 49-52 ◽  
Author(s):  
Sandrine Lépinay ◽  
Guillaume Laffont ◽  
Pierre Ferdinand ◽  
Marie Claude Millot ◽  
Benjamin Carbonnier
Keyword(s):  
Optical Fiber ◽  
Real Time ◽  
Optical Sensors ◽  
Chemical Sensor ◽  
Detection System ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Layer By Layer ◽  
Assembly Method ◽  
Host Properties

In this work, we demonstrate the possibility to use optical fiber incorporating photowritten tilted fiber Bragg gratings (TFBG) as optical detection system for the real time monitoring of interfacial adsorption events. For this purpose, immobilization of cyclodextrin polymers onto the surface of optical fiber was envisioned through the layer-by-layer self-assembly method with the aim of developing sensing layers with well-defined host properties. To verify the feasibility of our strategy, fluorescence microscopy was applied to evidence the effective inclusion of fluorescent molecular, toluene, within the cyclodextrin cavities present onto the optical fiber interface. In a further step, it was demonstrated that the elaboration of the multilayer assembly can be monitored in real time using the TFBG sensor. The host properties of the as-prepared sensing layers were directly applied to develop chemical sensor sensitive to toluene. It was found that the TFBG response was related to the toluene concentration and a linear dependence was observed in the low concentration regime.

The novel potential for embedded strain measurements offered by micro-structured optical fiber Bragg gratings

2015 ◽  
pp. 529-535
Author(s):  
T Geernaert ◽  
S Sulejmani ◽  
C Sonnenfeld ◽  
H Thienpont ◽  
F Berghmans ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
The Novel ◽  
Strain Measurements

Optical fiber Bragg gratings Part II Modeling of finite-length gratings and grating arrays

2002 ◽  
Vol 19 (9) ◽  
pp. 1855 ◽  
Author(s):  
Vittorio M. N. Passaro ◽  
Roberto Diana ◽  
Mario N. Armenise
Keyword(s):  
Optical Fiber ◽  
Finite Length ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings

Characterization of Optical Fiber Bragg Gratings as Strain Sensors Considering Load Direction

2008 ◽  
Author(s):  
Michael C. Emmons ◽  
Sunny Karnani ◽  
K. P. Mohanchandra ◽  
Gregory P. Carman ◽  
Stefano Trono ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Great Promise ◽  
Fiber Direction ◽  
Load Direction ◽  
Isotropic Composite ◽  
Loading Direction

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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