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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

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