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Proceedings Paper

Laser-induced fluorescence of phosphors for remote cryogenic thermometry
Author(s): David L. Beshears; G. J. Capps; Michael R. Cates; Cathy M. Simmons; S. W. Schwenterly
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Paper Abstract

Remote cryogenic temperature measurements can be made by inducing fluorescence in phosphors with temperature-dependent emissions and measuring the emission lifetimes. The thermographic phosphor technique can be used for making precision, noncontact, cryogenic-temperature measurements in electrically hostile environments, such as high dc electric or magnetic fields. The National Aeronautics and Space Administration is interested in using these thermographic phosphors for mapping hot spots on cryogenic tank walls. Europium-doped lanthanum oxysulfide (La2O2S:Eu) and magnesium fluorogermanate doped with manganese (Mg4FGeO6:Mn) are suitable for low-temperature surface thermometry. Several emission lines, excited by a 337-nm ultraviolet laser, provide fluorescence lifetimes having logarithmic dependence with temperature from 4 to above 125 K. A calibration curve for both La2O2S:Eu and Mg4FGeO6:Mn is presented, as well as emission spectra taken at room temperature and 11 K.

Paper Details

Date Published: 1 December 1990
PDF: 12 pages
Proc. SPIE 1370, Fiber Optic Smart Structures and Skins III, (1 December 1990); doi: 10.1117/12.24869
Show Author Affiliations
David L. Beshears, Oak Ridge National Lab. (United States)
G. J. Capps, Oak Ridge National Lab. (United States)
Michael R. Cates, Oak Ridge National Lab. (United States)
Cathy M. Simmons, Oak Ridge National Lab. (United States)
S. W. Schwenterly, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 1370:
Fiber Optic Smart Structures and Skins III
Richard O. Claus; Eric Udd, Editor(s)

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