Abstract
An optical model that predicts the reflection of light by a synthetic fiber of arbitrary cross-sectional shape is described. The model uses a Monte Carlo simulation of an exact ray trace of light for incident rays directed at a selected angle to the fiber axis. The model revealed an optical effect in round fibers that led to the prediction of a new mechanism for iridescence (change of color with angle of illumination or view) in a fabric by means of round, concentric, sheath–core fibers, with core size≤40% by volume and with the sheath and core dyed different colors. The prediction has been verified in actual fabrics.
© 1997 Optical Society of America
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