Title :
Systematic error resolved in NIST Johnson Noise Thermometer
Author :
Pollarolo, Alessio ; Tew, Weston ; Rogalla, Horst ; Underwood, Jason M. ; Benz, Samuel P.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
Johnson Noise Thermometry is an electronic approach to determine the Boltzmann constant k through measurement of the ratio of the noise power measured across a sense resistor at the triple point of water and the measured noise-power of a synthesized reference waveform. The reference waveform is synthesized by an array of Josephson junctions. In this paper, we show how incorrect averaging to determine the ratio can produce a systematic error in the measured value of k. We describe the appropriate algorithm to avoid this error.
Keywords :
constants; electric noise measurement; electric sensing devices; measurement errors; power measurement; resistors; sensor arrays; superconducting junction devices; temperature measurement; temperature sensors; thermal noise; thermometers; Boltzmann constant k; Johnson noise thermometry; Josephson junction array; NIST Johnson noise thermometer; measurement error; noise power measurement; sense resistor; synthesized reference waveform; systematic error resolution; water triple point; Electrical resistance measurement; Measurement uncertainty; Noise; Noise measurement; Resistors; Systematics; Temperature measurement; Boltzmann equation; Josephson junction; measurement units; noise measurement; standards; temperature measurement;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898241
