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1. Improved electronic measurement of the Boltzmann constant by Johnson noise Thermometry
Published: 8/19/2015
Authors: Weston Leo Tew, Samuel Paul Benz, Horst Rogalla, Alessio Pollarolo, D. R White, Jifeng Qu, Kunli Zhou
Abstract: The unit of thermodynamic temperature, the kelvin, will be redefined in 2018 by fixing the value of the Boltzmann constant, k. The present CODATA recommended value of k is determined predominantly by acoustic gas-thermometry results. To provide a v ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918053

2. Calibration of Cryogenic Resistance Thermometers between 0.65 K and 165 K on the International Temperature Scale of 1990
Series: Special Publication (NIST SP)
Report Number: 250 91
Published: 8/11/2015
Author: Weston Leo Tew
Abstract: Calibrations of cryogenic resistance thermometers at NIST are performed by comparison to standard thermometers on the International Temperature Scale of 1990 (ITS-90). The NIST Low Temperature Calibration Facility (LTCF) can accommodate most caps ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908763

3. A Standardized Interpolation of Temperature using Rhodium-Iron Resistance Thermometers over the Interval 4.2 K to 24.5 K
Published: 4/30/2015
Authors: Weston Leo Tew, Richard Rusby, Peng Lin, Peter Steur, L. Lipinski, Barrie W. A. Ricketson
Abstract: The worldwide history and current state of development of rhodium-iron resistance thermometers (RIRTs) is briefly reviewed. A standardized interpolation method using RIRTs with the nominal composition of 0.5 % Fe (by mole) is presented, with examples ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914837

4. Calibration of thin-film platinum sensors for use in the JILA Sr II Clock
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 8046
Published: 3/29/2015
Authors: Weston Leo Tew, Travis L Nicholson, Ross B. Hutson
Abstract: A set two pairs of thin-film platinum resistance thermometers (TFPRTs) have been calibrated on the International Temperature Scale of 1990 (ITS-90) for the purposes of determining temperatures inside the JILA Sr II Optical Lattice Clock vacuum ch ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916889

5. Systematic Error Resolved in NIST Johnson Noise Thermometer
Published: 8/24/2014
Authors: Alessio Pollarolo, Weston Leo Tew, Horst Rogalla, Samuel Paul Benz
Abstract: In the Johnson Noise Thermometry approach, Boltzmann‰s constant k is obtained as the ratio of the noise power measured across a sense resistor at the triple point of water and the noise power measured for a synthesized reference waveform. The ref ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915395

6. 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

7. 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

8. 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

9. 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

10. 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



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