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Punched Card For Photosensing Applications

IP.com Disclosure Number: IPCOM000095437D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Thomas, JE: AUTHOR

Abstract

A punched card which translates through its apertures light that is in a particular region of the spectrum but which otherwise is opaque to that light is useful in photosensing environments. Such a card can be prepared by incorporating in it a dye which absorbs light in a very narrow band in the spectrum.

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Punched Card For Photosensing Applications

A punched card which translates through its apertures light that is in a particular region of the spectrum but which otherwise is opaque to that light is useful in photosensing environments. Such a card can be prepared by incorporating in it a dye which absorbs light in a very narrow band in the spectrum.

For example, a card dyed with 3, 3' diethylthiatricarbocyanine iodide or 12 acetoxy - 3, 3' diethylthiapentocarbocyanine perchlorate is highly absorptive as to infra-red light. It lends itself to use in conjunction with a source of infra-red light comprising a semiconductor diode made from gallium arsenide or a gallium arsenide phosphide composition.

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