Response of FBG Sensors Embedded in SRM Interface of combustor When Subjected to Tri-Axial Normal Loadings

Abstract

In this paper, polymer packaged fiber Bragg grating (FBG) sensors are installed inside of the combustor wall to monitor the health of solid rocket motor. The responses of sensor embedded in adhesive specimen composed of propellant, insulation and case when subjected to axial and unaxial tensile stress are investigated. The strain distribution and spectrum of FBG were simulated when the specimen suffered from different normal loadings by finite element method and computer simulation technology. The result is validated by axis and unaxis tensile test. It is shown that the proposed type of sensing system can measure the bond stress(the radial stress) in SRMs.