Abstract
This report shows the results of the feasibility study to examine the applicability of fiber Bragg gratings (FBG) sensors to structural health monitoring of solid rocket motor cases, especially which are made of CFRP. For the study, a trial apparatus for a few FBG sensors which monitors strains and acoustic emission (AE) signal was designed and manufactured. The verification of the apparatus was carried out by the pressure test of a subscale motor case which was made of CFRP. The apparatus was manufactured by combining with DWDM components and CDWM components for large strain change. In the test, signals of FBG sensors were compared with conventional electrical resistance strain gages and piezoelectric AE sensors. The strain measurement results of FBG sensors and strain gages showed good agreement.
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