NDE technique for ceramic composites using embedded sapphire optical waveguides

Mahmoud A. El-Sherif; Jianming Yuan

doi:10.1117/12.259054

15 November 1996 NDE technique for ceramic composites using embedded sapphire optical waveguides

Mahmoud A. El-Sherif, Jianming Yuan

Proceedings Volume 2944, Nondestructive Evaluation of Materials and Composites; (1996) https://doi.org/10.1117/12.259054
Event: Nondestructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1996, Scottsdale, AZ, United States

Abstract

Advanced ceramic composites with complex architecture have stimulated interest in innovative embedded fiber optic sensors for in-situ real-time characterization of the structure. Careful selection of a compatible optical fiber material and an inexpensive signal detection technique are most critical factors for successful incorporation of these embedded sensors. The focus of this paper is two-fold. The first reports on the development of a novel optical waveguide consisting of sapphire fiber core and polycrystalline alumina cladding, and how can these fibers be embedded into ceramic composites. The second aspect of this paper is devoted to the application of a novel inexpensive and sensitive signal detection technique, namely, the spatial intensity modulation technique to sapphire optical fibers. This technique is applicable to multimode fibers. It is based on modal power distribution modulation under external perturbations. A theoretical model has been developed to correlate variations in the modal power within multimode optical fibers to the changes induced in the state of the hosting material. Numerical results obtained from the model are shown to be in agreement with experimental observations. This paper provides a novel means to characterize high temperature composites using multimode sapphire optical waveguides.

Citation Download Citation

Mahmoud A. El-Sherif and Jianming Yuan "NDE technique for ceramic composites using embedded sapphire optical waveguides", Proc. SPIE 2944, Nondestructive Evaluation of Materials and Composites, (15 November 1996); https://doi.org/10.1117/12.259054

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