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Thermoscope

IP.com Disclosure Number: IPCOM000098948D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Johnston, HT: AUTHOR

Abstract

In this device, light passes through a medium 20 having one roughened surface, such as that of frosted glass. The light is deflected or diffused and does not have the same intensity as it would have, if passed through glass having smooth or nondeflecting surfaces.

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Thermoscope

In this device, light passes through a medium 20 having one roughened surface, such as that of frosted glass. The light is deflected or diffused and does not have the same intensity as it would have, if passed through glass having smooth or nondeflecting surfaces.

A thin film of vaporizable liquid 25 is placed over an area of roughened glass
20. The liquid then forms a flat plane or nondiffusing area. If the liquid and glass are transparent, light passes through the glass. If, however, this liquid 25 is vaporized by heat, the roughened or diffusing surface is exposed. Light of the same intensity no longer passes through, since glass 20 is now translucent.

In utilizing this principle, there is provided a lamp 22 and a photocell 13. One is placed above, the other below, a closed chamber 10 of transparent material, the bottom of which is roughened. A liquid that vaporizes at a predetermined temperature is introduced into the chamber 10 and covers the roughened surface.

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