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Non-destructive Sensing an Infrared Stimuable Phosphor

IP.com Disclosure Number: IPCOM000098814D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Title, RS: AUTHOR

Abstract

Ordinarily infrared stimuable phosphors, such as SrS: Ce, Sm and SrS: Eu, Sm used as memory elements are interrogated with a light beam of a particular frequency. Such a method is destructive in that the readout signal interacts with the stored energy and changes its state. Now it has been discovered that storage in these phosphors is accompanied by a change in valence of the activators. This valence change is observable as a change in the paramagnetic spectrum of the activators. This effect is utilized as a non destructive sensing scheme.

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Non-destructive Sensing an Infrared Stimuable Phosphor

Ordinarily infrared stimuable phosphors, such as SrS: Ce, Sm and SrS: Eu, Sm used as memory elements are interrogated with a light beam of a particular frequency. Such a method is destructive in that the readout signal interacts with the stored energy and changes its state. Now it has been discovered that storage in these phosphors is accompanied by a change in valence of the activators. This valence change is observable as a change in the paramagnetic spectrum of the activators. This effect is utilized as a non destructive sensing scheme.

The drawing shows apparatus depicting the interrogation device.

The arrangement includes an infrared stimuable phosphor 1 provided with paramagnetic detection device including a magnetic field 2, a coil or microwave cavity 3 and a detector 4. Light of frequency stores information in the material. The detector provides a continuous non destructive sensing of the state of the element. The paramagnetic resonance absorption is modified while the phosphor is in the stored condition corresponding to the change of valence of the activators in the phosphor.

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