EPJ Web of Conferences 6, 34003 (2010)
https://doi.org/10.1051/epjconf/20100634003

Liquid Resin Infusion process monitoring with embedded superimposed long period and short period Bragg grating sensor.

¹ Laboratoire Hubert Curien, UMR CNRS 5516, 42000 Saint Etienne, France
² Université de Toulouse; INSA, UPS, Mines Albi, ISAE; ICA (Institut Clément Ader), CROMeP; Campus Jarlard, F-81013 Albi cedex 09, France
³ Ecole des Mines Albi, Campus Jarlard, F-81013 Albi, France

^a e-mail: Laurent.Robert@mines-albi.fr

Abstract

We propose here the monitoring of the Liquid Resin Infusion (LRI) process for using a superimposed long period (LPG) and short period (FBG) Bragg grating sensor. Monitoring of such a process is usually made measuring simultaneously temperature and strain by the use of an electro-optical device (FBG-Thermocouple). It has been shown that an applied solicitation is measured by a wavelength shift with a different sensitivity for LPG and FBG; thus strain and temperature influences can be determined separately by measuring corresponding wavelength shifts. The reported configuration is based on the use of these two Bragg gratings types written in the same fibre section, which allows us to discriminate the contributions of the temperature and strain. The sensor is embedded in a composite specimen manufactured by LRI process for monitoring in real time and simultaneously the applied temperature and strain.