Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Patent
1997-09-23
1999-03-23
Koslow, Melissa
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
2523014R, C09K 1181
Patent
active
058854843
ABSTRACT:
A high temperature phosphor consists essentially of a material having the general formula LuPO.sub.4 :Dy.sub.(x),Eu.sub.y) wherein: 0.1 wt %.ltoreq.x.ltoreq.20 wt % and 0.1 wt %.ltoreq.y.ltoreq.20 wt %.
The high temperature phosphor is in contact with an article whose temperature is to be determined. The article having the phosphor in contact with it is placed in the environment for which the temperature of the article is to be determined. The phosphor is excited by a laser causing the phosphor to fluoresce. The emission from the phosphor is optically focused into a beam-splitting mirror which separates the emission into two separate emissions, the emission caused by the dysprosium dopant and the emission caused by the europium dopent. The separated emissions are optically filtered and the intensities of the emission are detected and measured. The ratio of the intensity of each emission is determined and the temperature of the article is calculated from the ratio of the intensities of the separate emissions.
REFERENCES:
Allison et al., "Characterization of High-Temperature Thermographc Phosphors: Spectral Properties of LuP04:Dy(1%), Eu(2%)". Applied opticals, Vol. 34, No. 25, pp. 5624-27. Sep. 1, 1995.
Allison Stephen W.
Boatner Lynn A.
Cates Michael R.
Gillies George T.
Ericson Ivan L.
Koslow Melissa
Lockheed Martin Energy Research Corp.
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