Dual high-temperature measurements using Johnson-noise thermometry
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
- Country of Publication:
- United States
- Language:
- English
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