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Topic Area: Gas Metrology
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Displaying records 11 to 20 of 31 records.
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11. Frequency-stabilized cavity ring-down spectroscopy measurements of carbon dioxide isotope ratios
Topic: Gas Metrology
Published: 5/15/2011
Authors: Joseph Terence Hodges, David A Long, Mitchio Okumura, Charles E Miller
Abstract: Carbon dioxide (CO2) isotopic ratios were measured at 1.6 μm through the use of frequency-stabilized cavity ring-down spectroscopy (FS-CRDS). We report the highest spectrum signal-to-noise ratios to date for CO2 transitions, with values as high ...

12. Gas Standards Containing Hydrocarbon and Volatile Organic Compounds for Automobile Exhaust and Ambient Air Monitoring
Topic: Gas Metrology
Published: 8/1/2003
Author: George C Rhoderick

13. 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.

14. 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

15. Intensity Artifacts in Gas Phase FTIR Spectroscopy: Focus on the Aperture
Topic: Gas Metrology
Published: 2/1/2001
Authors: S W Sharpe, R L Sams, T J Johnson, Pamela M Chu

16. Long-Term Stability of Hydrocarbons in NIST Gas Standard Reference Material (SRM) 1800
Topic: Gas Metrology
Published: 8/2/2005
Author: George C Rhoderick

17. 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 ...

18. 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 ...

19. Noble gas viscosities at 25 degrees C
Topic: Gas Metrology
Published: 8/10/2012
Authors: Robert F Berg, William Cody Burton
Abstract: Near 25 C, ab initio calculations of the zero-density viscosity of helium gas eta_He have an uncertainty of approximately 0.001 %, which is 1/40th of the uncertainty of the best measurements. The uncertainties of the published calculations for neon [ ...

20. 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 ...

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