Development of a Four-channel System for Johnson Noise Thermometry

Published

December 30, 2010

Author(s)

Alessio Pollarolo, Chiharu Urano, Paul Dresselhaus, Jifeng Qu, Horst Rogalla, Samuel Benz

Abstract

Long integration time is necessary to reach low uncertainty when measuring temperature through Johnson Noise Thermometry (JNT). The main goal of the NIST JNT experiment is to achieve a 6×10-6 relative uncertainty in the measurement of the water triple point, which could contribute to the re-determination of Boltzmann's constant. A four-channel JNT system, which will reduce the measurement time two-fold, is being developed with new components, including a switchboard, an analog to digital converter (ADC) and a programmable, recharging power supply system. While implementing the new ADC, a source of systematic error was revealed, as well as a means to increase the measurement bandwidth.

Citation

IEEE Transactions on Instrumentation and Measurement

Volume

60

Issue

7

Pub Type

Journals

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Keywords

Boltzmann s equation, correlation, digital analog conversion, Josephson arrays, measurement units, noise measurement, quantization, signal synthesis, standards, temperature.

Citation

Pollarolo, A. , Urano, C. , Dresselhaus, P. , Qu, J. , Rogalla, H. and Benz, S. (2010), Development of a Four-channel System for Johnson Noise Thermometry, IEEE Transactions on Instrumentation and Measurement, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905961 (Accessed December 6, 2024)