Abstract
The temperature-compensated strain measurement was demonstrated for the CFRP cure process monitoring by the parallel use of two fiber optic measurement technique. One is pulse-prepump Brillouin optical time domain analysis (PPP-BOTDA) system, and the other is fibber Bragg grating (FBG) sensor. Both PPP-BOTDA and FBG sensor system can acquire an axial strain and the temperature change as the center frequency change and the center wavelength change by means of the spectrum shifting. For accurate distributed residual strain measurement of the embedded optical fiber by PPP-BOTDA systems, it is necessary to compensate the influence of the temperature change in the cure process. In this study, a novel temperature compensation method was applied by using the difference in strain and temperature sensitivity between PPP-BOTDA and FBG system.
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