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You searched on: Author: weston tew

Displaying records 21 to 30 of 59 records.
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21. Measurement Time and Statistics for a Noise Thermometer With a Synthetic-Noise Reference
Published: 8/1/2008
Authors: D. R White, Samuel Paul Benz, J Labenski, Sae Woo Nam, Jifeng Qu, H Rogalla, Weston Leo Tew
Abstract: This paper describes methods for reducing the statistical uncertainty in measurements made by noise thermometers using digital cross correlators, and in particular, for thermometers using pseudorandom noise for the reference signal. First, a discrete ...

22. Adjustments to the NIST Realization of the ITS-90 from 5 K to 24.5561 K
Published: 5/1/2008
Authors: Weston Leo Tew, Christopher W Meyer
Abstract: Recent clarifications issued by the Consultative Committee on Thermometry (CCT) for the definitions of the equilibrium hydrogen (e-H2) triple points (TPs) and vapor-pressure points (VPs) have resulted in adjustments to the NIST-disseminated ITS-90 (T ...

23. Estimating the Triple Point Isotope Effect and the Corresponding Uncertainties for Cryogenic Fixed Points
Published: 2/1/2008
Author: Weston Leo Tew
Abstract: The estimation of sensitivities of melting temperatures due to isotopic variations in monatomic and diatomic atmospheric gases is developed from both theoretical and semi-empirical standpoints. The state of what is currently known regarding vapor pre ...

24. A Determination of the Ratio of the Zinc Freezing Point to the Tin Freezing Point by Noise Thermometry
Published: 9/12/2007
Authors: Weston Leo Tew, John Labenski, Samuel Paul Benz, Sae Woo Nam, Paul David Dresselhaus
Abstract: We have used a Johnson-Noise Thermometer (JNT) with a Quantized Voltage Noise Source (QVNS) as a calculable reference to determine the ratio of temperatures near the Zn freezing point to those near the Sn freezing point. The temperatures are derived ...

25. Resistance-Based Scaling of LF-and MF-Band Thermal Noise Powers
Published: 4/1/2007
Authors: John Labenski, Weston Leo Tew, Sae Woo Nam, Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs
Abstract: A conventional technique for scaling thermal noise power in Johnson Noise Thermometry (JNT) is via resistance ratios. We describe measurements in the low to medium frequency (LF/MF) bands using this approach via correlation methods in the frequency d ...

26. ITS-90 Non-Uniqueness From PRT Subrange Inconsistencies Over the Range 24.56 K to 273.16 K
Published: 9/1/2006
Authors: Christopher W Meyer, Weston Leo Tew
Abstract: Calculations have been performed to study ITS-90 non-uniqueness over the range 24.5561 K to 273.16 K, where the scale is defined by an interpolating platinum resistance thermometer (PRT) that is calibrated via sets of defined fixed points. Over this ...

27. Acoustic Thermometry: New Results From 273 K to 77 K and Progress Towards 4 K
Published: 1/1/2006
Authors: Laurent Pitre, Michael R Moldover, Weston Leo Tew
Abstract: We used a quasi-spherical cavity as an acoustic and microwave resonator to measure the thermodynamic temperatures T of the triple points of mercury, argon, neon, and equilibrium hydrogen, and to measure the difference T - T90, in the range 7 K to 273 ...

28. Comment on Freezing Point Mixtures of H^d2^^u16^O With H^d2^^u17^O and Those of Aqueous CD^d3^CH^d2^OH and CH^d3^^u13^CH^d2^OH Solutions
Published: 10/1/2005
Authors: Weston Leo Tew, D. R White

29. Isotopic and Other Influences of the Realization of the Triple Point of Hydrogen
Published: 8/1/2005
Authors: B Fellmuth, L Wolber, Y Hermier, F Pavese, PPM Steur, I Peroni, A Szmyrka-Grzebyk, L Lipinski, Weston Leo Tew, H Nakano, H Sakurai, O Tamura, D I Head, K D Hill, A G Steele
Abstract: Within an international collaboration of the eight metrological institutes represented by the authors, the dependence of the triple-point tmeperature of equilibrium, hydrogen on the deuterium content at low concentrations has been precisely determine ...

30. Progress on Johnson Noise Thermometry using a Quantum Voltage Noise Source for Calibration
Published: 4/1/2005
Authors: Sae Woo Nam, Samuel Paul Benz, Paul David Dresselhaus, Charles J Burroughs, Weston Leo Tew, D. R White, John M. Martinis
Abstract: We describe our progress towards a high-precision measurement of temperature using Johnson noise. Using a Quantized Voltage Noise Source (QVNS) based on the Josephson effect as a calculable noise source, we have been able to measure the ratio of the ...

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