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You searched on: Topic Area: Gas Metrology

Displaying records 1 to 10 of 28 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 ...

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 ...

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 ...

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 ...

5. 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, ...

6. 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 ...

7. 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 ...

8. 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 ...

9. 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 ...

10. Standard Photoacoustic Spectrometer: Model and Validation using O2 A-Band Spectra
Topic: Gas Metrology
Published: 6/30/2010
Authors: Keith A Gillis, Daniel K. Havey, Joseph Terence Hodges
Abstract: We model and measure the absolute response of an intensity-modulated photoacoustic spectrometer comprising a 10 cm long resonator and having a {I}Q{/I}-factor of approximately 30. We present a detailed theoretical analysis of the system and predict ...

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