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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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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  • SP 250-XX: Calibration Services
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