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Author: weston tew
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1. Thermodynamic Analysis and Experimental Study of the Effect of Atmospheric Pressure on the Ice Point
Published: 9/24/2013
Authors: Allan H Harvey, Mark O McLinden, Weston Leo Tew
Abstract: We present a detailed thermodynamic analysis of the temperature of the ice point as a function of atmospheric pressure. This analysis makes use of accurate international standards for the properties of water and ice, and of available high-accuracy da ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910516

2. Characteristics of Rhodium-Iron Resistance Thermometers And Interpolation Properties From 0.65 K To 24.5561 K
Published: 9/12/2013
Authors: Weston Leo Tew, Richard Rusby
Abstract: Resistance thermometers using wires of rhodium with 0.5 mol % of iron (Rh-Fe thermometers or RIRTs) were first made by H Tinsley & Co in 1969 for applications at low temperatures, below the range where standard platinum resistance thermometers can be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911708

3. Improvements to the Johnson Noise Thermometry System for Measurements at 505 ‹ 800 K
Published: 9/12/2013
Authors: Weston Leo Tew, Kazuaki Yamazawa, Samuel Paul Benz, Alessio Pollarolo, Horst Rogalla, Paul David Dresselhaus
Abstract: The National Institute of Standards and Technology (NIST) is currently using Johnson noise thermometry (JNT) to determine the deviations of the International Temperature Scale of 1990 (ITS-90) from the thermodynamic temperature in the range of 505‹93 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911459

4. Normal and Anomalous Self-Heating in Capsule-type Resistance Thermometers in the Range 1 K to 273 K
Published: 9/12/2013
Authors: Weston Leo Tew, Christopher W Meyer
Abstract: The normal self-heating coefficient for standard capsule-type resistance thermometers is gas-mediated over most of their designed range of use. This is readily modeled and calculated for thermometers with helium fill gas from known transport properti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912064

5. The Residual and Temperature-Dependent Resistance of Reference-Grade Platinum Wire Below 13.8 K
Published: 9/12/2013
Authors: Weston Leo Tew, William E. Murdock, Michal J Chojnacky, Dean C Ripple
Abstract: We report the Residual Resistance Ratio (RRR) and resistance ratio W(GaMP) (gallium melting point) values for well-annealed samples of the original SRM 1967, its contemporary substitute SRM 1967a, and a collection of NIST capsule-type SPRTs. The RRR ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911582

6. Johnson-noise thermometry based on a quantized-voltage noise source at NIST
Published: 9/11/2013
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Paul David Dresselhaus, Horst Rogalla, Weston Leo Tew
Abstract: Johnson Noise Thermometry is an electronic approach to measuring temperature. For several years, NIST has been developing a switching-correlator-type Johnson-noise thermometer that uses a quantized voltage noise source as an accurate voltage referenc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910730

7. The Residual Resistance Ratio of High-Purity Platinum
Published: 8/22/2011
Authors: Weston Leo Tew, William E. Murdock, Michal J Chojnacky, Dean C Ripple
Abstract: High-purity platinum wire is produced for use in both Standard Platinum Resistance Thermometers (SPRTs) and type S and type R thermocouples. The resistance ratio W(T90) and thermoelectric characteristics of the wire are a function of chemical purity ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908775

8. An electronic measurement of the Boltzmann constant
Published: 3/30/2011
Authors: Samuel Paul Benz, Alessio Pollarolo, Jifeng Qu, Horst Rogalla, Chiharu Urano, Weston Leo Tew, Paul David Dresselhaus, D. R White
Abstract: The Boltzmann constant was measured by comparing the Johnson noise of a resistor at the triple point of water with a quantum-based voltage reference signal generated with a superconducting Josephson-junction waveform synthesizer. The measured value ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907640

9. APPLICATIONS OF THERMAL AND QUANTIZED VOLTAGE NOISE FOR INTRINSIC TEMPERATURE STANDARDS
Published: 3/18/2011
Authors: Weston Leo Tew, Samuel Paul Benz
Abstract: The recent advances in ac waveform synthesis using quantized voltage pulses have enabled new methods for the measurement of absolute temperature. At the same time, the increased linearity and sampling rates of digital electronics have established fre ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907802

10. Improved Estimates of the Isotopic Correction Constants for the Triple Point of Water
Published: 9/14/2010
Authors: Weston Leo Tew, D. R White
Abstract: In 2006, the CIPM clarified the definition of the kelvin by specifying the isotopic composition of the water to be used in the realisation of the triple point. At the same time, the Consultative Committee on Thermometry gave recommended values for th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905083



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