Nanotube-containing polymeric films for use as optical strain sensors (original) (raw)

2004

Abstract

The project is concerned with the development of polymeric coatings for use as remotely-sensed non-contact strain gauges whereby the strain is measured using stress-induced Raman band shifts. The aim is to measure local strain on the micron level and so it is necessary to use materials with microstructures in the nanometer size range. Nanostructured coating materials based upon polyurethane polymers with low vol. fractions (<0.1%) of single-walled carbon nanotubes have being developed that give both well-defined Raman spectra and large stress-induced band shifts. Through the use of the polarization of the Raman laser beam it is possible to measure strains in different directions and hence det. the principal strains. A remote Raman microprobe with a laser beam focused to 1 m has been employed using a fiber optic link to the spectrometer. Examples will be given of the use of the coatings to monitor the deformation of a no. of different substrates such including aluminum and polymer sheets. [on SciFinder (R)]

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