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Proceedings Paper

Optical response of a sapphire multimode optical sensor for ceramic composite applications
Author(s): Mahmoud A. El-Sherif; Shichuang Hu; Jayakumar Radhakrishnan; Frank K. Ko; Don J. Roth; Brad Lerch
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Paper Abstract

The main objective of this study is the development of an embedded fiber optic sensor for testing ceramic composites in a very high temperature environment. The sensing element is an optical grade sapphire fiber operating on the principle of spatial modulation in a multimode waveguide. In order to employ this waveguide as a stress sensor, optomechanical testing has been performed to examine the optical response to external stresses. Several tests, including tension, micro-bending, and lateral compression, are in progress. These tests will establish the basis for using embedded optical sensors for characterization of ceramic composites in real environment. The principles of operation and experimental investigations on the microbending tests are presented in this paper. The results show that the developed sensor can be applied for stress monitoring as well as displacement measurements in a very high temperature environment.

Paper Details

Date Published: 7 February 1994
PDF: 8 pages
Proc. SPIE 2072, Fiber Optic Physical Sensors in Manufacturing and Transportation, (7 February 1994); doi: 10.1117/12.166859
Show Author Affiliations
Mahmoud A. El-Sherif, Drexel Univ. (United States)
Shichuang Hu, Drexel Univ. (United States)
Jayakumar Radhakrishnan, Drexel Univ. (United States)
Frank K. Ko, Drexel Univ. (United States)
Don J. Roth, NASA Lewis Research Ctr. (United States)
Brad Lerch, NASA Lewis Research Ctr. (United States)


Published in SPIE Proceedings Vol. 2072:
Fiber Optic Physical Sensors in Manufacturing and Transportation
John W. Berthold; Richard O. Claus; Michael A. Marcus; Robert S. Rogowski, Editor(s)

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