Laser-induced fluorescence of phosphors for remote cryogenic thermometry

David L. Beshears; G. J. Capps; Michael R. Cates; Cathy M. Simmons; S. W. Schwenterly

doi:10.1117/12.24869

1 December 1990 Laser-induced fluorescence of phosphors for remote cryogenic thermometry

David L. Beshears, G. J. Capps, Michael R. Cates, Cathy M. Simmons, S. W. Schwenterly

Proceedings Volume 1370, Fiber Optic Smart Structures and Skins III; (1990) https://doi.org/10.1117/12.24869
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States

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.

Citation Download Citation

David L. Beshears, G. J. Capps, Michael R. Cates, Cathy M. Simmons, and S. W. Schwenterly "Laser-induced fluorescence of phosphors for remote cryogenic thermometry", Proc. SPIE 1370, Fiber Optic Smart Structures and Skins III, (1 December 1990); https://doi.org/10.1117/12.24869

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