Laser-induced fluorescence of phosphors for remote cryogenic thermometry

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6762176

Beshears, D L; Capps, G J; Cates, M R; Simmons, C M; Schwenterly, S W

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, non-contact, cryogenic temperature measurements in electrically hostile environments, such as high DC electric or magnetic fields. NASA is interested in utilizing these thermographic phosphors for mapping hot spots on cryogenic tank walls. Europium-doped lanthanum oxysulfide (La{sub 2}O{sub 2}S:Eu) and magnesium fluorogermanate doped with manganese (Mg{sub 4}(F)GeO{sub 6}:Mn) are suitable for low-temperature surface thermometry. Several emission lines, excited by a 337 nm UV laser, provide fluorescence lifetimes having logarithmic dependence with temperatures from 4 to 125 Kelvin. A calibration curve for both La{sub 2}O{sub 2}S:Eu and Mg{sub 4}(F)GeO{sub 6}:Mn are presented as well as emission spectra taken at room temperature and 7 Kelvin.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: National Aeronautic and Space Administration (NASA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6762176
• Report Number(s): CONF-9009274-1; ON: DE91001221
• Resource Relation: Conference: OE/Fibers 90, San Jose, CA (USA), 16-21 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
PHOSPHORS
FLUORESCENCE
SURFACES
THERMOGRAPHY
TANKS
CALIBRATION
CRYOGENICS
CRYOSTATS
EMISSION SPECTRA
LANTHANUM COMPOUNDS
LASER RADIATION
MAGNESIUM COMPOUNDS
REMOTE SENSING
TEMPERATURE DEPENDENCE
TEMPERATURE MEASUREMENT
ALKALINE EARTH METAL COMPOUNDS
CONTAINERS
CONTROL EQUIPMENT
ELECTROMAGNETIC RADIATION
EQUIPMENT
LUMINESCENCE
MEASURING METHODS
RADIATIONS
RARE EARTH COMPOUNDS
SPECTRA
THERMOSTATS
440500* - Thermal Instrumentation- (1990-)