Realization of the Quantum Metrological Triangle at PTB
The realization of the quantum metrological triangle at the Physikalisch-Technische Bundesanstalt (PTB) is based on calibration capabilities for the capacitance towards a Quantum-Hall resistance，the Josephson voltage standard，and an Electron Counting Capacitance Standard (ECCS) experiment. For transferring electrons one by one onto a cryogenic vacuum capacitor with a decade capacitance of 1 pF a so-called r-pump will be used. All components are presently under investigation before the complete measurement setup will be employed. While the cryogenic capacitance value shows better than 10-6 reproducibility after cycling，the measured dwell times of the electrons of 30 seconds could be too short for closing the triangle with the aimed uncertainty of less than 10-7. Furthermore，calibration capabilities for the capacitance to a calculable capacitor and towards a Quantum-Hall resistance are improved.
Quantum Metrological Triangle PTB Josephson voltage standard Quantum-Hall resistance ECCS
R.Behr F.Ahlers S.Lotkhov H.Scherer G.D.Willenberg A.Zorin J.Schurr
Physikalisch-Technische Bundesanstalt (PTB),Bundesallee 100,D-38116 Braunschweig,Germany
国内会议
北京
英文
26-32
2007-09-05（万方平台首次上网日期，不代表论文的发表时间）