Real-time method and apparatus for measuring the decay-time constant of a fluorescing phosphor

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United States of America Patent

PATENT NO 5949539
SERIAL NO

08966657

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Abstract

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A method for determining the decay-time constant of a fluorescing phosphor is provided, together with an apparatus for performing the method. The apparatus includes a photodetector for detecting light emitted by a phosphor irradiated with an excitation pulse and for converting the detected light into an electrical signal. The apparatus further includes a differentiator for differentiating the electrical signal and a zero-crossing discrimination circuit that outputs a pulse signal having a pulse width corresponding to the time period between the start of the excitation pulse and the time when the differentiated electrical signal reaches zero. The width of the output pulse signal is proportional to the decay-time constant of the phosphor.

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Patent Owner(s)

Patent OwnerAddress
AMERICAN IRON AND STEEL INSTITUTE1101- 17TH STREET N W SUITE 1300 WASHINGTON DC 20036

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Allison, Steve W Knoxville, TN 5 58
Beshears, David L Knoxville, TN 12 183
Britton, Jr Charles L Alcoa, TN 9 337
Cates, Michael R Oak Ridge, TN 14 138
Simpson, Marc L Knoxville, TN 10 108

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