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Superposition of fiber Bragg and LPG gratings for embedded strain measurement
Institution: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
Abstract: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.
Keywords:Strain  Embedded sensors  Optical fiber gratings  Déformation  Capteurs enfouis  Réseaux fibrés
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