NASA NTRS · 19700000026
A method for the visual detection of holes in thin polymeric films
Abstract
Back-lighting polymeric film with polarized light from a polarizing plate and viewing it through a second plate cross-polarized to the back-lighting provides visual contrast between the flaw and the transparent film.
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Von Volkli, A. D., Wiedekamp, K. E.. 1970-04-01. A method for the visual detection of holes in thin polymeric films. https://ntrs.nasa.gov/citations/19700000026
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