The concentricity and uniformity of nearly concentric transparent plastic coatings extruded onto optical fibers are determined by a sensitive, nondestructive optical technique. The method is based on the location of unique fringes in the backscattered light arising from a beam that is incident at right angles to the fiber's axis. Results from both uniform and distorted coatings are shown, and instrumentation suitable for on-line coating diagnosis and correction is presented.
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H. M. Presby (1976) studied this question.