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Displaying records 11 to 20 of 28 records.
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11. High Definition Flow
Topic: Gas Metrology
Published: 8/1/2009
Authors: John D Wright, Michael R Moldover
Abstract: From pharmaceutical production to the natural gas market, exact flow measurements are critical. Here's how NIST helps keep us all on the same page.

12. Improving acoustic determinations of the Boltzmann constant with mass spectrometer measurements of the molar mass of argon
Topic: Gas Metrology
Published: 9/30/2015
Authors: Inseok Yang, Laurent Pitre, Michael R Moldover, Jintao Zhang, XiaoJuan Feng, Jin Seog Kim
Abstract: We determined accurate values of ratios among the average molar masses MAr of 9 argon samples using two completely-independent techniques: (1) mass spectroscopy and (2) measured ratios of acoustic resonance frequencies. The two techniques yielded m ...

13. Infrared Absorptivity Temperature Dependence of Gas Phase Methanol and Sulfur Dioxide
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6773
Topic: Gas Metrology
Published: 8/1/2001
Authors: Pamela M Chu, George C Rhoderick, P. A. Johnson

14. Long-term stability of metal-envelope enclosed ionization gauges
Topic: Gas Metrology
Published: 12/1/2012
Authors: James A Fedchak, Dana R Defibaugh
Abstract: Ionization vacuum gauges are used as secondary standards by calibration laboratories and as transfer standards in intercomparisons among metrology laboratories. A quantitative measurement of gauge stability with respect to the gauge calibration fact ...

15. Microwave Determination of the Volume of a Pressure Vessel
Topic: Gas Metrology
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 ...

16. Natural Gas Flow Calibration Service
Series: Special Publication (NIST SP)
Topic: Gas Metrology
Published: 8/1/2008
Author: Aaron N Johnson
Abstract: This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow calibrations are conducted offsite at the Colorado Experimental Engineering Station Incorporated (CEESI) in Garner, Iowa. A parallel array of nine tur ...

17. On spectroscopic models of the O2 A-band and their impact upon atmospheric retrievals
Topic: Gas Metrology
Published: 6/27/2012
Authors: David A Long, Joseph Terence Hodges
Abstract: Highly accurate spectroscopic models for O2 A-band absorption are required in numerous satellite- and ground-based remote sensing measurements of atmospheric greenhouse gases. In this study, we quantify the sensitivity of the calculated A-band transm ...

18. Optimizing Acoustic Measurements of the Boltzmann Constant
Topic: Gas Metrology
Published: 11/22/2009
Author: Michael R Moldover
Abstract: We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant {I}R{/I} using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophys ...

19. Photoacoustic Spectrometer for Accurate, Continuous Measurements of Atmospheric Carbon Dioxide Concentration
Topic: Gas Metrology
Published: 6/19/2014
Authors: Joseph Terence Hodges, Zachary D Reed, Brent A Sperling, Roger D van Zee, James R Whetstone, Keith A Gillis
Abstract: We have developed a portable photoacoustic spectrometer that offers routine, precise and accurate measurements of atmospheric carbon dioxide mixing ratios. The spectrometer is temperature controlled, continuously samples and dries atmospheric air, ...

20. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Topic: Gas Metrology
Published: 8/1/2007
Authors: E May, Robert F Berg, Michael R Moldover
Abstract: We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the unce ...

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