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You searched on: Topic Area: Gas Metrology

Displaying records 1 to 10 of 30 records.
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1. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918559

2. Dew-point Measurements For Water In Compressed Carbon Dioxide
Topic: Gas Metrology
Published: 8/7/2015
Authors: Christopher W Meyer, Allan H Harvey
Abstract: When transporting CO2 for sequestration, it is important to know the water dew point in order to avoid condensation that can lead to corrosion. We have constructed a flow apparatus to measure the water content at saturation in a compressed gas. A s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917841

3. "Weighing" a Gas With Microwave and Acoustic Resonances
Topic: Gas Metrology
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 ("tank") with a relative uncertainty of {I}u{/I}^dr^({I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917698

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917302

5. Recommended isolated-line profile for representing high-resolution spectroscopic transitions
Topic: Gas Metrology
Published: 9/11/2014
Authors: Joseph Terence Hodges, Jonathan Tennyson, P F. Bernath, Alain Campargue, A Csaszar, L Daumont, R R Gamache, D Lisak, Olga Naumenko, Lawrence Rothman, Ha Tran, N Zobov, Boone Chris, L Gianfrani, Jean Michel Hartmann
Abstract: Recommendations of an IUPAC Task Group formed in 2011 on ,Intensities and line shapes in high-resolution spectra of water isotopologues from Experiment and Theory" (Project No. 2011-022-2- 100) on line profiles of high-resolution rotational-vibrati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915509

6. 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, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915516

7. Differential cavity ring-down spectroscopy
Topic: Gas Metrology
Published: 5/9/2013
Authors: Jeremie B. Courtois, Katarzyna Ewelina Bielska, Joseph Terence Hodges
Abstract: We present a technique called differential cavity ring-down spectroscopy (D-CRDS) for reducing etaloning effects in a ring-down spectrometer. The method relies on alternately measuring and then subtracting intra-cavity losses associated with pairwi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912785

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911249

9. Second-order boundary corrections to the radial acoustic eigenvalues for a spherical cavity
Topic: Gas Metrology
Published: 8/17/2012
Author: Keith A Gillis
Abstract: We calculated the eigenvalues of the radially-symmetric acoustic modes of a gas-filled, spherical cavity to order ({delta}^dT^/{I}a{/I})^u2^, where {delta}^dT^ is the thickness of the thermal boundary layer and {I}a{/I} is the radius of the cavity. O ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911620

10. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910425



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