Superposition of fiber Bragg and LPG gratings for embedded strain measurement

Romain Guyard; Dominique Leduc; Yann Lecieux; Cyril Lupi

doi:10.1016/j.crhy.2016.07.014

Probing matter with electromagnetic waves / Sonder la matière par les ondes électromagnétiques

Superposition of fiber Bragg and LPG gratings for embedded strain measurement
[Réseau de Bragg et réseau longue période superposés pour la mesure de déformation au cœur des matériaux]

Romain Guyard ¹ ; Dominique Leduc ¹ ; Yann Lecieux ¹ ; Cyril Lupi ¹

¹ Institut de génie civil et de mécanique (GeM), l'UNAM Université, Université de Nantes, UMR CNRS 6183, 2, rue de la Houssinière, 44322 Nantes, France

Comptes Rendus. Physique, Volume 17 (2016) no. 9, pp. 1027-1037.

Résumé
Abstract

Une nouvelle architecture de capteur de déformations à fibre optique basée sur la superposition d'un réseau de Bragg et d'un réseau longue période est proposée afin de mesurer, à partir de deux signaux linéairement indépendants, les déformations transverse et longitudinale dans un milieu hôte. Un dimensionnement du capteur est réalisé par résolution numérique des conditions de résonance des réseaux ; il est démontré la possibilité d'évaluer simultanément ces déformations sans altération de la précision des mesures par rapport aux capteurs de déformation à fibre optique classiques.

When a fiber Bragg grating strain sensor is embedded inside a structure, the interaction of the sensor with the host material can lead to spurious results if the radial strain is neglected. In this article, we use numerical simulations to show that the axial and radial strains can be simultaneously measured with a single fiber in which a Bragg grating and a long-period grating are superimposed. Moreover, we present an optimal architecture of the sensor.

Publié le : 2016-08-11

DOI : 10.1016/j.crhy.2016.07.014

Keywords: Strain, Embedded sensors, Optical fiber gratings
Mot clés : Déformation, Capteurs enfouis, Réseaux fibrés

Affiliations des auteurs :

Romain Guyard ¹ ; Dominique Leduc ¹ ; Yann Lecieux ¹ ; Cyril Lupi ¹

¹ Institut de génie civil et de mécanique (GeM), l'UNAM Université, Université de Nantes, UMR CNRS 6183, 2, rue de la Houssinière, 44322 Nantes, France

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     author = {Romain Guyard and Dominique Leduc and Yann Lecieux and Cyril Lupi},
     title = {Superposition of fiber {Bragg} and {LPG} gratings for embedded strain measurement},
     journal = {Comptes Rendus. Physique},
     pages = {1027--1037},
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Romain Guyard; Dominique Leduc; Yann Lecieux; Cyril Lupi. Superposition of fiber Bragg and LPG gratings for embedded strain measurement. Comptes Rendus. Physique, Volume 17 (2016) no. 9, pp. 1027-1037. doi : 10.1016/j.crhy.2016.07.014. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.07.014/

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