Development of a quantum-voltage-calibrated noise thermometer at NIM

Journal Article · Wed Sep 11 00:00:00 EDT 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4821369· OSTI ID:22218019

Qu, J.; Zhang, J. T.; Fu, Y. ^[1]; Rogalla, H.; Pollarolo, A.; Benz, S. P. ^[2]

---

1. National Institute of Metrology, Beijing 100013, P. R. (China)
2. National Institute of Standards and Technology, Boulder, CO 80305 (United States)

A quantum-voltage-calibrated Johnson-noise thermometer was developed at NIM, which measures the Boltzmann constant k by comparing the thermal noise across a 100 Ω sense resistor at the temperature of the triple point of water with the pseudo-random frequency-comb voltage waveform synthesized with a bipolar-pulse-driven quantum-voltage-noise source. A measurement with integration period of 10 hours and bandwidth of 640 kHz resulted in a relative offset of 0.5×10{sup −6} from the current CODATA value of k, and a type A relative standard uncertainty of 23×10{sup −6}. Benefiting from closely matched noise powers and transmission-line impedances and small nonlinearities in the cross-correlation electronics, the derived k shows self-consistent values and standard uncertainties for different measurement bandwidths.

• OSTI ID: 22218019
• Journal Information: AIP Conference Proceedings, Vol. 1552, Issue 1; Conference: 9. international temperature symposium, Los Angeles, CA (United States), 19-23 Mar 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COMPARATIVE EVALUATIONS
CORRELATIONS
ELECTRIC POTENTIAL
IMPEDANCE
NOISE
NOISE THERMOMETERS
NONLINEAR PROBLEMS
RANDOMNESS
RESISTORS
SUPERCONDUCTING JUNCTIONS
TRIPLE POINT
WATER
WAVE FORMS