Abstract
A scanning technique using a photodiode has been developed for estimating the glass fibre volume fractions in composites with opaque matrices. The information is derived from light transmitted along the reinforcing fibres by total internal reflection. The method described has advantages over a previous method based on photographic techniques and it is possible to gain information about the uniformity of fibre distribution within the composite. Results obtained with glass fibre reinforced cement and plaster specimens are described. The transmission of light through the composite is proportional to the volume fraction of glass fibres up to a limiting value of ∼6% Inhomogeneous fibre distribution can be detected using this technique. For cement samples the curing history is important as the degree of interaction between the cement and the glass has a marked influence on the glass transmittance.
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