Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1997-11-10
1999-09-07
Hantis, K P
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
2504581, G01J 330
Patent
active
059495391
ABSTRACT:
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.
REFERENCES:
patent: 4049970 (1977-09-01), Ford
patent: 4224519 (1980-09-01), Gammage et al.
patent: 4652143 (1987-03-01), Wickersheim et al.
patent: 4752141 (1988-06-01), Sun et al.
patent: 4776827 (1988-10-01), Greaves
patent: 4895156 (1990-01-01), Schulze
patent: 5107445 (1992-04-01), Jensen et al.
patent: 5232285 (1993-08-01), Mannik
patent: 5255980 (1993-10-01), Thomas et al.
patent: 5304809 (1994-04-01), Wickersheim
patent: 5332316 (1994-07-01), Kleinerman
patent: 5414266 (1995-05-01), Sun
patent: 5600147 (1997-02-01), Jensen
patent: 5818582 (1998-10-01), Fernandez et al.
Bruce W. Noel, et al., "Thermographic-Phosphor Temperature Measurements: Commerical and Defense-Related Applications," Instrum. Soc. Am. Paper No. 94-1003, 1994, pp. 271-288.
"A CMOS Integrated Circuit for Pulse-Shape Discrimination", S.S. Frank, et al., Proceedings of the 1995 IEEE Nuclear Science Symposium and Medical Imaging Conference, OART 1 (of 3), vol. 1, 21-28 Oct. 1995, pp. 297-300.
Allison Steve W.
Beshears David L.
Britton, Jr. Charles L.
Cates Michael R.
Simpson Marc L.
American Iron and Steel Institute
Hantis K P
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