6 August 2001 Simultaneous temperature and strain monitoring of composite cure using a Brillouin-scattering-based distributed fiber optic sensor
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Abstract
A fiber optic distributed sensing system has been used for in-situ measurement of in-plane strain and temperature variation during the curing of AS4-3501 composite. The distributed sensing system based on Brillouin scattering has a spatial resolution of 15 cm. In this paper, we present preliminary experimental results on the Brillouin frequency shift measured by an optical fiber embedded within a 16-ply composite panel during the heat-up, isothermal hold and cool-down stages of the cure process. By deducting the temperature effects, the average strain profile along the mid-plane of the composite panel at various stages of the cure process can be seen. The distributed sensor can detect the reaction advancement by measuring the cure shrinkage at the gelation and vitrification stages. Shrinkage is then correlated with the degree of cure data from Differential Scanning Calorimetry (DSC) obtained for the same cure cycle. The thermal response of the solidified composite during cooling is also profiled. Details of the data processing the Brillouin frequency shift data to obtain strain as a function of cure temperature, time and location have been explained. The measurement accuracy is discussed. The ultimate goal of this research is to detect in real time the evolution of process-induced strains within these materials.
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Chao Huang, Chao Huang, Xiaoyi Bao, Xiaoyi Bao, Xiaodong Zeng, Xiaodong Zeng, Antoine Arcand, Antoine Arcand, Pearl Lee-Sullivan, Pearl Lee-Sullivan, } "Simultaneous temperature and strain monitoring of composite cure using a Brillouin-scattering-based distributed fiber optic sensor", Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); doi: 10.1117/12.435544; https://doi.org/10.1117/12.435544
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