Josephson Voltage Metrology for Watt Balance Experiments at NIST

• Autorzy: Tang Y.-H.
• Języki publikacji: EN

Abstrakty

EN

The Planck constant, h, is one of the seven fundamental constants proposed to redefine the SI. It has been measured by the watt balance experiments since the 1980s. In its early days, the watt balance experiment played a vital role in determining the Josephson constant KJ-90 which was adopted internationally on January 1, 1990. The development of Josephson technology, especially the implementation of the Programmable Josephson Voltage Standard (PJVS) in voltage metrology has improved the uncertainty of voltage measurement in the watt balance experiment by more than two orders of magnitude. The Josephson voltage measurement in the watt balance experiment plays an important role in the proposed SI redefinition based on a set of fundamental constants. This paper will describe a brief history from the original NIST-1 watt balance in 1980s up to the most recent development of the NIST-4 watt balance. We will also discuss the role of voltage metrology in the watt balance experiments and the impact of the SI redefinition to the voltage metrology in the future.

Słowa kluczowe

EN

Josephson voltage standard; Planck constant; programmable Josephson voltage standard; International System of Units (SI); watt balance; uncertainty

• Wydawca: Wydawnictwo PAK
• Czasopismo: Measurement Automation Monitoring
• Rocznik: 2016
• Tom: Vol. 62, No. 2
• Strony: 42--45
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Tang Y.-H.

• National Institute OF Standards and Technology, Gaithersburg, MD 20899, USA

Bibliografia

• [1] Taylor B. N. and Witt T. J.: New International Electrical Reference Standards Based on the Josephson and Quantum Hall Effects, Metrologia, vol. 26, pp. 47–62, 1989.
• [2] Belecki N. B., Dziuba R. F., Field B. F. and Taylor B. N.: Guidelines for Implementing the New Representations of the Volt and Ohm Effective January 1, 1990, NIST Technical Note 1263, June 1989.
• [3] Hamilton C. A., Benz S. P., Burroughs C. J. and Harvey T. E.: SNS Programmable Voltage Standard, IEEE Trans. Appl. Supercon. vol. 7, pp. 2472–2475, 1997.
• [4] Josephson B. D., Phys. Lett., 1, 251 (1962).
• [5] Field B. F., Finnegan T .F. and Toots J.: Volt maintenance at NBS via 2e/h: A new definition of the NBS volt, Metrologia, vol. 9, pp. 155- 166, 1973.
• [6] Niemeyer J., Hinken J. H. and Kautz R. L.: Microwave-induced constant-voltage steps at one volt from a series array of Josephson junctions, Appl. Phys. Lett. 45, 478, 1984.
• [7] Burroughs C. J., Dresselhaus P. D., Rüfenacht A., Olaya D., Elsbury M. M., Tang Y. and Benz S. P.: NIST 10 V Programmable Josephson Voltage Standard System, IEEE Trans. Instrum. Meas. vol. 60, pp. 2482-2485, July 2011.
• [8] Solve S. and Stock M.: BIPM direct on-site Josephson voltage standard comparisons: 20 years of results, Measurement Science and Technology, 23, 2012, 124001.
• [9] Harben J., Tang Y., Parks H. and Wachert J.: The 2014 North American Josephson Voltage Interlaboratory Comparison, NCSLI MEASURE, vol. 10, No. 4, pp. 52-58, October 2015.
• [10] Kibble B. P.: Atomic Masses and Fundamental Constants, edited by J. H. Sanders and A. H. Wapstra (Plenum, New York, 1976), vol. 5, p. 545.
• [11] Steiner R.: History and progress on accurate measurements of the Planck constant, Rep. Prog. Phys. 76, (2013) 016101.
• [12] Special issue on “Watt and joule balances, the Planck constant and the kilogram,” Metrologia, vol. 51, S1-S140, 2014
• [13] Tang Y., Solve S. and Witt T.J.: Allan Variance Analysis of Josephson Voltage Standard Comparison for Data Taken at Unequal Time Intervals, IEEE Trans. Instrum. Meas. vol. 60, pp. 2248-2254, July 2011.
• [14] Tang Y., Seifert F. and Schlamminger S.: Improvement of Leakage Resistance of PJVS for NIST-4 Watt Balance Experiment, submitted for CPEM 2016.
• [15] Bettin H., Fujii K., Mana G., Massa E. and Picard A.: Accurate measurements of the Avogadro and Planck constants by counting silicon atoms, Ann. Phys. (Berlin) vol. 525, pp. 680–687, 2013.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę