Laser-induced fluorescence of phosphors for remote cryogenic thermometry
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:
- NASA
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6762176
- Report Number(s):
- CONF-9009274-1; ON: DE91001221
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
ALKALINE EARTH METAL COMPOUNDS
CALIBRATION
CONTAINERS
CONTROL EQUIPMENT
CRYOGENICS
CRYOSTATS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
EQUIPMENT
FLUORESCENCE
LANTHANUM COMPOUNDS
LASER RADIATION
LUMINESCENCE
MAGNESIUM COMPOUNDS
MEASURING METHODS
PHOSPHORS
RADIATIONS
RARE EARTH COMPOUNDS
REMOTE SENSING
SPECTRA
SURFACES
TANKS
TEMPERATURE DEPENDENCE
TEMPERATURE MEASUREMENT
THERMOGRAPHY
THERMOSTATS