Title :
Development of Johnson Noise Thermometer Using Quantum Voltage Noise Source
Author :
C. Urano;Y. Okazaki;T. Yamada;K. Yamazawa;Y. Fukuyama;N. Kaneko;M. Maruyama;A. Domae;S. Yoshida;S. Kiryu;H. Yamamori;J. Tamba
Author_Institution :
Nat. Inst. of Adv. Ind. Sci. &
fDate :
7/1/2015 12:00:00 AM
Abstract :
In an effort to refine the value of the Boltzmann constant (k), we made thermodynamic temperature measurements of k using a Johnson noise thermometry (JNT) system, currently under development, using a quantum voltage noise source (QVNS). The JNT system measures the power spectrum density (PSD) of a sensor resistor using the PSD of a QVNS as a reference. k is then obtained using the Johnson-Nyquist equation. k obtained in our measurements to date has an offset of + (3.7±0.1)×10-5 from the CODATA value.
Keywords :
"Resistors","Temperature measurement","Voltage measurement","Electrical resistance measurement","Josephson junctions","Standards","Fitting"
Conference_Titel :
Superconductive Electronics Conference (ISEC), 2015 15th International
DOI :
10.1109/ISEC.2015.7383450
