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Search Publications by: Weston L. Tew (Fed)

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Displaying 51 - 75 of 75

Johnson Noise Thermometry Measurements Using a Quantized Voltage Noise Source for Calibration

April 1, 2003
Author(s)
Sae Woo Nam, Samuel Benz, Paul Dresselhaus, Weston L. Tew, David R. White, John M. Martinis
We describe a new approach to Johnson Noise Thermometry(JNT) that takes advantage of recent advances in Josephson voltage standards and digital signal processing techniques. Currently, high-precision thermometry using Johnson noise is limited by the non

A ratiometric method for Johnson noise thermometry using a quantized voltage noise source

January 1, 2003
Author(s)
Sae Woo Nam, Samuel Benz, John M. Martinis, Paul Dresselhaus, Weston L. Tew, David R. White
Johnson Noise Thermometry (JNT) involves the measurement of the statistical variance of a fluctuating voltage across a resistor in thermal equilibrium. Modern digital techniques make it now possible to perform many functions required for JNT in highly

Recent Results of NIST Realizations of the ITS-90 Below 84 K

January 1, 2003
Author(s)
Weston L. Tew, Christopher W. Meyer
The results at NIST of realizations and comparisons of the ITS-90 below 84 K are presented. The 3He and 4He vapor pressure scales (0.65 K to 5.0 K), and the interpolating constant volume gas thermometer (ICVGT) scale (5.0 K to 24.556 K) as realized from

The NIST Low Temperature ITS-90 Realization and Calibration Facilities

October 1, 2002
Author(s)
Christopher W. Meyer, Weston L. Tew
Two facilities have been constructed at NIST for realizing and maintaining the ITS-90 below 84 K. The first facility is an integrated low temperature realization system that realizes the ITS-90 below 84 K in its entirety and which we refer to as the Low

A New Approach to Johnson Noise Thermometry using a Josephson Quantized Voltage Source

April 1, 2002
Author(s)
Samuel Benz, John M. Martinis, Sae Woo Nam, Weston L. Tew, David R. White
We describe a new approach to Johnson Noise Thermometry (JNT) that addresses certain limitations found in the conventional approach. The concept takes advantage of recent advances in digital synthesis and signal processing techniques together with advances

The Role of High-purity Noble Metals in Precision Thermometry

November 1, 2001
Author(s)
Dean C. Ripple, Gregory F. Strouse, Weston L. Tew
A variety of alternate calibration schemes which approximate the ITS-90 are possible when using high-purity noble metals. The high purity of the sensor materials allows the use of correlations that exist between the measured properties at fixed point

The Kelvin and Temperature Measurements

January 1, 2001
Author(s)
Billy W. Mangum, G T. Furukawa, Kenneth G. Kreider, Christopher W. Meyer, Dean C. Ripple, Gregory F. Strouse, Weston L. Tew, Robert D. Saunders, Bettye C. Johnson, Howard W. Yoon, Michael R. Moldover, Charles E. Gibson
The International Temperature Scale of 1990 (ITS90) is defined from 0.65 K upwards to the highest temperature measurable by spectral radiation thermometry, the radiation thermometry being based on the Planck radiation law. Part I of this paper describes

Non-Uniquenes of the ITS-90 From 13.8033 K to 24.5561 K

June 1, 1999
Author(s)
Christopher W. Meyer, Gregory F. Strouse, Weston L. Tew
The International Temperature Scale of 1990 (ITS-90) is defined in the region 3.0 K to 24.5561 K by an interpolating constant volume gas thermometer (ICVGT) that is calibrated at three specified fixed points. From 13.8033 K to 1234.93 K the ITS-90 is