Title :
Development of thermodynamic temperature measurement system based on quantum voltage noise source at NMIJ
Author :
Urano, Chiharu ; Yamada, Tomoaki ; Yamazawa, K. ; Fukuyama, Yasuhiro ; Kaneko, Naoya ; Maruyama, Mihoko ; Domae, Atsushi ; Yamamori, T. ; Yoshida, Sigeru ; Kiryu, Syogo
Author_Institution :
Nat. Metrol. Inst. of Japan, AIST, Tsukuba, Japan
Abstract :
We have been developing a Johnson noise thermometer (JNT) at NMIJ toward redefinition of the Boltzmann constant k. The JNT system measure thermal noise power of a resistor installed at the triple point of water and power of a reference signal generated with a Quantum Voltage Noise Source (QVNS) alternatively in order to obtain k precisely. Relative differences between experimentally obtained k and the current CODATA value was 7 part in 10-5. Relative statistical uncertainty of k for 18 hours measurement was 2 parts in 10-5.
Keywords :
constants; electric noise measurement; power measurement; quantum noise; resistors; signal generators; temperature measurement; thermal noise; thermodynamics; thermometers; Boltzmann constant k; CODATA; JNT system; Johnson noise thermometer; NMIJ; QVNS; quantum voltage noise source; reference signal generation; relative statistical uncertainty; resistor; thermal noise power measurement; thermodynamic temperature measurement system; time 18 hour; Electrical resistance measurement; Josephson junctions; Noise; Resistors; Temperature measurement; Thermodynamics; Voltage measurement; Boltzmann constant; Josephson Junctions arrays; Noise thermometry; Quantum Voltage Noise Source; SI unit;
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.2014.6898243
