Strain monitoring by evanascent wave spectroscopy

Vivek Kapila; Lidvin Kjerengtroen; William M. Cross; F. J. Johnson; Jon J. Kellar

doi:10.1117/12.352789

12 July 1999 Strain monitoring by evanascent wave spectroscopy

Vivek Kapila, Lidvin Kjerengtroen, William M. Cross, F. J. Johnson, Jon J. Kellar

Proceedings Volume 3675, Smart Structures and Materials 1999: Smart Materials Technologies; (1999) https://doi.org/10.1117/12.352789
Event: 1999 Symposium on Smart Structures and Materials, 1999, Newport Beach, CA, United States

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.

Citation Download Citation

Vivek Kapila, Lidvin Kjerengtroen, William M. Cross, F. J. Johnson, and Jon J. Kellar "Strain monitoring by evanascent wave spectroscopy", Proc. SPIE 3675, Smart Structures and Materials 1999: Smart Materials Technologies, (12 July 1999); https://doi.org/10.1117/12.352789

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