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Proceedings Paper

Strain monitoring by evanascent wave spectroscopy
Author(s): Vivek Kapila; Lidvin Kjerengtroen; William M. Cross; F. J. Johnson; Jon J. Kellar
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Paper Abstract

Prior interferometric fiber sensors and evanescent wave fiber sensors have proven useful in obtaining information about portions of the lifetime of a composite materials. The overall goal of this research is to develop an IR evanescent wave sensor system that can be used to monitor lifetime of a polymer matrix composite. In this regard, a single fused silica core fiber was placed across a miniature materials tester, while simultaneously having the fiber ends attached to an IR spectrometer. The fiber was strained in increments by the MINIMAT, while the IR spectrometer allowed simultaneous determination of the IR spectrum. An increase in baseline absorbance across the entire IR spectrum occurred as the strain increased. The increase in absorbance is relate to an increase in strain in the fiber. From regression analysis of independent measurements of fiber strain and absorbance, a strong relation between the change in absorbance and change in strain energy was found. Future work will involve incorporation of the strain sensing approach with evanescent wave chemical sensing to allow total lifetime monitoring of polymer matrix composites.

Paper Details

Date Published: 12 July 1999
PDF: 9 pages
Proc. SPIE 3675, Smart Structures and Materials 1999: Smart Materials Technologies, (12 July 1999); doi: 10.1117/12.352789
Show Author Affiliations
Vivek Kapila, South Dakota School of Mines and Technology (United States)
Lidvin Kjerengtroen, South Dakota School of Mines and Technology (United States)
William M. Cross, South Dakota School of Mines and Technology (United States)
F. J. Johnson, South Dakota School of Mines and Technology (United States)
Jon J. Kellar, South Dakota School of Mines and Technology (United States)


Published in SPIE Proceedings Vol. 3675:
Smart Structures and Materials 1999: Smart Materials Technologies
Manfred R. Wuttig, Editor(s)

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