Dual high-temperature measurements using Johnson-noise thermometry

Conference · Tue Sep 01 00:00:00 EDT 1981

OSTI ID:5339269

Billeter, T R; Cannon, C P

A temperature transducer fabricated of tungsten-rhenium thermocouple elements terminated in a rhenium coil acts as a dual temperature measuring device due to both a dc output from the thermocouple elements and a thermally-generated noise emitted from the rhenium coil. In performed tests, a bare wire thermocouple in close proximity to the test transducer acted as the reference temperature measuring device. Comparisons of the JNPT and the reference at temperatures up to 1500/sup 0/C generally yielded agreement within 4% of reading. However, because of reduced insulation resistance and interference due to spurious (non-thermal) noise, the JNPT transducer exhibited increasingly inaccurate temperature measurements above 1500/sup 0/C. Hafnia- and beryllia-insulated transducers were fabricated for these tests. At all temperatures, beryllia yielded a higher insulation resistance by a factor of 10.

• Research Organization: Hanford Engineering Development Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76FF02170
• OSTI ID: 5339269
• Report Number(s): HEDL-SA-2542-FP; CONF-820306-11; ON: DE82018960; TRN: 82-015935
• Resource Relation: Conference: 6. symposium on temperature, Washington, DC, USA, 14 Mar 1982
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
LOFT REACTOR
REACTOR INSTRUMENTATION
THERMOCOUPLES
ACCURACY
PERFORMANCE TESTING
MEASURING INSTRUMENTS
PWR TYPE REACTORS
REACTORS
RESEARCH AND TEST REACTORS
TANK TYPE REACTORS
TEST REACTORS
TESTING
WATER COOLED REACTORS
WATER MODERATED REACTORS
220600* - Nuclear Reactor Technology- Research
Test & Experimental Reactors