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A Luminescent Infrared Spectroscope

IP.com Disclosure Number: IPCOM000096429D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Fowler, A: AUTHOR [+2]

Abstract

The device determines the spectral composition of an unknown infrared source by observing the selective phosphorescence of an infrared stimulated phosphor. The phosphors have graded composition which respond selectively to unknown infrared, thus giving a visual indication of the spectrum of the unknown source. The graded composition phosphors in discrete segments A... F are placed on the outside surface of the inner wall of a special demountable and pumpable Dewar flask. The external optical system and Dewar flask permit the stimulation of the phosphor while it is free from a contaminating atmosphere and while it is at a low temperature.

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A Luminescent Infrared Spectroscope

The device determines the spectral composition of an unknown infrared source by observing the selective phosphorescence of an infrared stimulated phosphor. The phosphors have graded composition which respond selectively to unknown infrared, thus giving a visual indication of the spectrum of the unknown source. The graded composition phosphors in discrete segments A... F are placed on the outside surface of the inner wall of a special demountable and pumpable Dewar flask. The external optical system and Dewar flask permit the stimulation of the phosphor while it is free from a contaminating atmosphere and while it is at a low temperature.

The system requires that the phosphor strips A... F be first irradiated with intense ultraviolet light at liquid nitrogen temperature to fill the traps. The unknown infrared source is then focused onto the strips. The position of the phosphor strip at which no stimulation of visible phosphorescence occurs indicates the high energy cutoff of the unknown infrared radiation. The composition of the strips should correspond to (Zn. x) (Cd. yS):10-4Cu, Cl. As the value of y varies from 0 for strip A to about 0. 7 for strip F (x + y = 1. 0), the energy of the infrared radiation which stimulates phosphorescence at liquid nitrogen temperature decreases from 1. 0 electron volt to 0. 3 electron volts.

An alternative arrangement involves the selective quenching of ultraviolet excited fluorescence. The stru...