Translucent Web Material Detector
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
A detector can discriminate between translucent material and transparent, opaque or no material by providing a photosensor located at one end of a black hole with the light source being directed such that the light hits the side of the hole. With a translucent web of material above the hole, the light from the light source is refracted and is sensed by the photosensor to indicate the presence of the web.