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