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Search Publications by: Gregory F. Strouse (Fed)

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Displaying 26 - 50 of 70

Faster, Better, Cheaper: New Automated Vacuum Calibration Service at NIST

October 1, 2012
Author(s)
Jacob E. Ricker, Jay H. Hendricks, Douglas A. Olson, Gregory F. Strouse
In today’s fast-paced world and ever expanding quality assurance requirements, the National Institute of Standards and Technology (NIST) has developed a system to fill the need for faster, better, and cheaper low pressure calibrations (0.65 Pa to 130 kPa)

Thermal Analysis of Refrigeration Systems Used for Vaccine Storage

August 2, 2012
Author(s)
Michal J. Chojnacky, Gregory F. Strouse
The CDC administers over $3 billion worth of vaccines per year through the Vaccines for Children program. Vaccine storage temperature is critical to maintaining drug potency, and as much as one-third of delivered vaccines are wasted due to thermal

Room Temperature Acoustic Transducers for High-Temperature Thermometry

July 9, 2012
Author(s)
Dean C. Ripple, William E. Murdock, Gregory F. Strouse, Keith A. Gillis, Michael R. Moldover
We have successfully conducted highly-accurate, primary acoustic thermometry at 600 K using a sound source and a sound detector at room temperature. We describe the source, the detector, and the ducts that connected them to our cavity resonator. This

Thermal Analysis of Refrigeration Systems Used for Vaccine Storage

November 2, 2009
Author(s)
Michal J. Chojnacky, W Wyatt Miller, Dean C. Ripple, Gregory F. Strouse
Each year, billions of dollars of vaccines are stored in refrigerators at the facilities of a variety of medical providers. Many vaccines must be maintained in the range 2 °C to 8 °C to retain product potency. We have tested the performance of two types of

NIST-NRC COMPARISON OF TOTAL IMMERSION LIQUID-IN-GLASS THERMOMETERS

February 1, 2009
Author(s)
Kendra Hill, D.J. Gee, Christina D. Cross, Gregory F. Strouse
The use of liquid-in-glass thermometers is described in many documentary standards in the fields of environmental testing, material testing, and material transfer. Many national metrology institutes, including the National Institute of Standards and

Maintenance and Validation of Liquid-in-Glass Thermometers

January 1, 2009
Author(s)
Christina D. Cross, Dean C. Ripple, Gregory F. Strouse
Liquid-in-glass thermometers are pervasive in use throughout industry and provide a convenient method for measuring temperature over for a broad range of applications with reasonable stability and accuracy. However, liquid-in-glass thermometers are subject

Recommended List of Common Impurities for Metallic Fixed-point Materials of the ITS-90

August 18, 2008
Author(s)
Dean C. Ripple, Anatoly Pokhodun, Peter Steur, Gregory F. Strouse
Working Group 1 of the Consultative Committee for Thermometry (CCT) has recommended methods for estimating the uncertainties of fixed-point temperatures attributable to chemical impurities [1]. These methods require chemical analysis of all commonly found

Proficiency Testing for Achieving Accreditation in Thermometry

June 5, 2008
Author(s)
Sally S. Bruce, Gregory F. Strouse
The establishment of traceability is an essential component of laboratory accreditation for Calibration laboratories accredited by the National Voluntary Laboratory Accreditation Program (NVLAP). Traceability requires that an unbroken chain of comparisons

Acoustic Thermometry Results From 271 K to 552 K

September 8, 2007
Author(s)
Dean C. Ripple, Gregory F. Strouse, Michael R. Moldover
The NIST Acoustic Thermometer determines the thermodynamic temperature from measurements of ratios of the speed of sound of argon in a spherical cavity. We report recent results for T - T90 on 12 isotherms spanning the range 271 K to 552 K. (T is the

Selection of Alternatives to Liquid-in-Glass Thermometers

October 1, 2005
Author(s)
Dean C. Ripple, Gregory F. Strouse
A desire to increase automation or to eliminate the use of mercury has prompted several ASTM committees to consider alternatives to ASTM Liquid-in-Glass (LiG) thermometers. In this paper, we address the technical issues of choosing an alternative. We first

NIST Realization of the ITS-90 Gallium Fixed Point

August 1, 2005
Author(s)
Gregory F. Strouse
As defined by the International Temperature Scale of 1990 (ITS-90), the gallium melting-point cell (29.7646 C) is used in the calibration of standard platinum resistance thermometers (SPRTs) for the ITS-90 subranges from 39 C to 30 C and from 0 C to 30 C

Stabilization of SPRTs for ITS-90 Calibrations

August 1, 2005
Author(s)
Dennis B. Minor, Gregory F. Strouse
At the National Institute of Standards and Technology (NIST), the ITS-90 calibration of standard platinum resistance thermometers (SPRTs) is performed in the Platinum Resistance Thermometer Calibration Laboratory over the temperature range from -189 C to

Standard Reference Material 1751 - A Gallium Melting-Point Standard

August 1, 2004
Author(s)
Gregory F. Strouse
The melting point of gallium %2829%2E7646%B0C%29 is a defining thermometric fixed point of the International Temperature Scale of 1990 %28ITS%2D90%29%2E Realization of this melting point is performed using a fixed%2Dpoint cell containing high%2Dpurity

Progress in Primary Acoustic Thermometry at NIST: 273 K to 505 K

September 1, 2003
Author(s)
Gregory F. Strouse, Dana R. Defibaugh, Michael R. Moldover, Dean C. Ripple
The NIST Acoustic Thermometer determines the thermodynamic temperature by measuring the speed of sound of argon in a spherical cavity. We obtained the thermodynamic temperature of three fixed points on the Interna-tionalTemperature Scale of 1990: the

Techniques for Primary Acoustic Thermometry to 800 K

September 1, 2003
Author(s)
Dean C. Ripple, Dana R. Defibaugh, Michael R. Moldover, Gregory F. Strouse
The NIST Primary Acoustic Thermometer will measure the difference between the International TemperatureScale of 1990 and the Kelvin Thermodynamic Scale throughout the range 273 K to 800 K with uncertainties of only afew millikelvins. The acoustic

Summary of Comparison of Realizations of the ITS-90 Over the Range 83.8058 K to 933.473 K: CCT Key Comparison CCT-K3

April 1, 2002
Author(s)
Billy W. Mangum, Gregory F. Strouse, William F. Guthrie, R Pello, M F. Stock, E Renaot, Y Hermier, G Bonnier, P Marcarino, K S. Gam, K H. Kang, Y G. Kim, J V. Nicholas, D. R. White, T D. Dransfield, Y Duan, Y Qu, J Connolly, R L. Rusby, J Gray, G J. Sutton, D I. Head, K D. Hill, A G. Steele, K Nara, Tony J. Tegeler, U Noatsch, D Heyer, B Fellmuth, B Thiele-Krivoj, S Duris, A I. Pokhodun, N P. Moiseeva, A G. Ivanova, P A. de Groot, J F. Dubbeldam
This is a report to the Comite Consultatif de Thermometrie (CCT) on Key Comparison 3, i.e., the comparison of realizations of the ITS-90 over the range 83.8058 K to 933.473 K. The differences in the realizations of the various fixed points in this range of

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