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1. ,WeighingŠ a Gas With Microwave and Acoustic Resonances
Published: 3/24/2015
Authors: Keith A Gillis, James B. Mehl, James W Schmidt, Michael R Moldover
Abstract: With calibrations of large flow meters in mind, we established the feasibility of determining the mass {I}M{/I}of argon gas contained within a 0.3 m^u3^ commercially manufactured pressure vessel (,tankŠ) with a relative uncertainty of {I}u{/I}^dr^({I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917698

2. Microwave Determination of the Volume of a Pressure Vessel
Published: 12/9/2014
Authors: Michael R Moldover, James W Schmidt, Keith A Gillis, James B. Mehl, John D Wright
Abstract: Using microwave techniques that are scalable to very large volumes, we measured the interior volume of a 0.3 m^u3^, commercially-manufactured, pressure vessel with an uncertainty of 0.05 %, as confirmed by independent, more-accurate, gas-expansion me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917302

3. Viscosity-ratio measurements with capillary viscometers
Published: 5/20/2014
Authors: Robert F Berg, Eric F. May, Michael R Moldover
Abstract: Viscosity-ratio measurements made with capillary viscometers exploit the accurate values of the viscosity of helium resulting from ab initio calculations. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic thermo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914155

4. ACOUSTIC GAS THERMOMETRY
Published: 1/16/2014
Authors: Michael R Moldover, Roberto M Gavioso, James B Mehl, Laurent Pitre, Michael de Podesta, Jintao Zhang
Abstract: We review the principles, techniques and results from primary acoustic gas thermometry (AGT). Since the establishment of ITS-90, the International Temperature Scale of 1990, spherical and quasi-spherical cavity resonators have been used to realize pr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914033

5. Viscosity-ratio measurements with capillary viscometers
Published: 11/27/2013
Authors: Robert F Berg, Eric F. May, Michael R Moldover
Abstract: Viscosity-ratio measurements made with capillary viscometers exploit the accurate values of the viscosity of helium calculated ab initio. Accurate values of the argon-to-helium viscosity ratio are now used for primary acoustic gas thermometry and for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914936

6. IMPROVEMENTS TO NIST'S AIR SPEED CALIBRATION SERVICE
Published: 9/24/2013
Authors: Iosif I Shinder, Christopher J. Crowley, Bernard J Filla, Michael R Moldover
Abstract: We discuss five significant improvements to the Air Speed Calibration Service conducted by the National Institute of Standards and Technology (NIST): 1. Reduced-uncertainty calibrations of the secondary standard [Laser Doppler Anemometer, (LDA)] us ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914255

7. Improved Determination of the Boltzmann Constant using a Single, Fixed-Length Cylindrical Cavity
Published: 8/27/2013
Authors: Hong Lin, Keith A Gillis, XiaoJuan Feng, Michael R Moldover, J.P. Sun, J.T. Zhang, Y.Y. Duan
Abstract: We report improvements to our previous [Zhang et al., Intl. J. Thermophysics, 32, 1297 (2011)] determination of the Boltzmann constant kB using a single 80 mm-long cylindrical cavity. In this work, the shape of the gas-filled resonant cavity is clos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913803

8. Calibration of a Long-Wavelength Acoustic Flowmeter Using a Lumped Impedance Acoustic Model
Published: 8/26/2013
Authors: Lee James Gorny, Keith A Gillis, Michael R Moldover
Abstract: As a part of NIST‰s program to standardize measurements of greenhouse gas emissions, we are developing long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurement of flue gas flows, for example, from coal-burning power plants. A L ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914137

9. The Effect of Turbulence on a Multi-Hole Pitot Calibration
Published: 6/10/2013
Authors: Christopher J. Crowley, Iosif I Shinder, Michael R Moldover
Abstract: Abstract- Accurate calibrations of multi-hole Pitot tubes require thousands of measurements spanning ranges of the fluid‰s velocity, and the pitch and yaw angles. When calibrating a commercially-manufactured multi-hole Pitot tube in NIST‰s low-turbul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912762

10. Microwave measurements for gas thermometry up to the copper point
Published: 5/13/2013
Authors: XiaoJuan Feng, Keith A Gillis, Michael R Moldover, James B Mehl
Abstract: We measured 5 microwave resonance frequencies {I}f{/I}^dN^ of an argon-filled cylindrical cavity at temperatures up to 1349 K. The repeatability of both the measured frequencies {I}u{/I}({I}f{/I}^dN^) and the scaled half-widths {I}u{/I}({I}g{/I}^dN^ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913447



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