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Publication Citation: Development of a Four-channel System for Johnson Noise Thermometry

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Author(s): Alessio Pollarolo; Chiharu Urano; Paul D. Dresselhaus; Jifeng Qu; Horst Rogalla; Samuel P. Benz;
Title: Development of a Four-channel System for Johnson Noise Thermometry
Published: December 30, 2010
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
Pages: pp. 2655 - 2659
Keywords: Boltzmann s equation, correlation, digital analog conversion, Josephson arrays, measurement units, noise measurement, quantization, signal synthesis, standards, temperature.
Research Areas: Quantum Electrical Measurements, Johnson Noise Thermometry, Superconducting Electronics
PDF version: PDF Document Click here to retrieve PDF version of paper (393KB)