Browse Prior Art Database

Translucent Web Material Detector

IP.com Disclosure Number: IPCOM000049811D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Fennema, AA: AUTHOR [+2]

Abstract

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.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 82% of the total text.

Page 1 of 2

Translucent Web Material Detector

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.

As shown in the figure, a photodetector 1 is located at the end of a hole 2 which has its interior surface 3 covered by a light-absorbing material such as a dull black coating. Light beams 4 emitted by a light source 5 are directed at the sides 3 of the hole 2 in order to absorb the light beams. A light-absorbing background 6 prevents the photosensor 1 from sensing any of the light emitted by the source 5. When the translucent material 7 is placed above the hole, the light beams 4 are refracted with some of the light being directed towards the photosensor 1 to generate an electrical signal which can be used to indicate that the web of material is present.

If the web of material is opaque rather than translucent, the photosensor 1 sees no light and therefore no output signal is generated. If the web of material 7 is clear, the light beams 4 will likewise be absorbed by the sides 3 of the hole 2 just as with an absence of the web material and no output signal will be generated by the photosensor 1. The detector therefore senses onl...