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Proceedings Paper

Raman stress sensor for localized stress measurements in composite laminates
Author(s): Bish Arjyal; Costas Galiotis
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Paper Abstract

A new stress/strain sensor for localized measurements in polymer based composites, has been developed and tested. The stress/strain dependent property is the frequency of the atomic vibrations of reinforcing fibers which can be proved with laser Raman spectroscopy. Measurements can be conducted in reinforcing fibers near the surface of laminates. For measurements in the bulk of composites, the exciting laser light has to be transported to the reinforcing fibers via an embedded fiber optic cable. The backscattered light is transmitted through the same fiber optic and is sent to the Raman spectrometer for analysis. The effect of the direction of the fiber optic cable with respect to the axis of the reinforcing fibers is examined. Finally, the relationships between the local fiber stress or strain obtained from the Raman sensor and the far field stress or strain measured conventionally, are established.

Paper Details

Date Published: 21 September 1995
PDF: 10 pages
Proc. SPIE 2509, Smart Structures: Optical Instrumentation and Sensing Systems, (21 September 1995); doi: 10.1117/12.221108
Show Author Affiliations
Bish Arjyal, Queen Mary and Westfield College (United Kingdom)
Costas Galiotis, Queen Mary and Westfield College (United Kingdom)

Published in SPIE Proceedings Vol. 2509:
Smart Structures: Optical Instrumentation and Sensing Systems
Deepak G. Uttamchandani, Editor(s)

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