Abstract
TRANSPARENT plastic sheet and film of most types of polymer respond well to the Schlieren technique, and this method can be used to obtain magnified images of inhomogeneities in the material which are normally not detectable by visual inspection. A very simple method based on the Schlieren principle has been developed which requires only an ordinary slide projector and a clean-cut square piece of an opaque material such as cardboard or thin sheet metal the size of which should be somewhat larger than that of the front lens of the projector.
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ALLEN, H. Detection of Inhomogeneities in Transparent Plastic Sheet by a Simple Schlieren Technique. Nature 180, 50 (1957). https://doi.org/10.1038/180050a0
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DOI: https://doi.org/10.1038/180050a0
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