Raman stress sensor for localized stress measurements in composite laminates

Bish Arjyal; Costas Galiotis

doi:10.1117/12.221108

21 September 1995 Raman stress sensor for localized stress measurements in composite laminates

Bish Arjyal, Costas Galiotis

Proceedings Volume 2509, Smart Structures: Optical Instrumentation and Sensing Systems; (1995) https://doi.org/10.1117/12.221108
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

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.

Citation Download Citation

Bish Arjyal and Costas Galiotis "Raman stress sensor for localized stress measurements in composite laminates", Proc. SPIE 2509, Smart Structures: Optical Instrumentation and Sensing Systems, (21 September 1995); https://doi.org/10.1117/12.221108

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