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Author: Keith Gillis

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1. 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 ...

2. 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 ...

3. Determination of mass-specific optical cross sections of multicomponent aerosols by combining electrical mobility and mass separation with laser absorption and extinction spectroscopy
Published: 7/22/2013
Authors: James Gregory Radney, Xiaofei Ma, Keith A Gillis, Michael Russel Zachariah, Joseph Terence Hodges, Christopher D Zangmeister
Abstract: The optical properties of atmospheric aerosols vary widely, being dependent upon particle composition, morphology and mixing state. This diversity and complexity of aerosols motivates measurement techniques that can discriminate and quantify a variet ...

4. 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^ ...

5. Second-order boundary corrections to the radial acoustic eigenvalues for a spherical cavity
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 ...

6. Room Temperature Acoustic Transducers for High-Temperature Thermometry
Published: 7/9/2012
Authors: Dean C Ripple, William E. Murdock, Gregory F Strouse, Keith A Gillis, Michael R Moldover
Abstract: We have successfully conducted highly-accurate, primary acoustic thermometry at 600 K using a sound source and a sound detector at room temperature. We describe the source, the detector, and the ducts that connected them to our cavity resonator. Thi ...

Published: 6/22/2012
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 a long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurements of exhaust flows from coal-burning power plants. Measurements of ...

8. Progress toward redetermining the Boltzmann constant with a fixed-path-length cylindrical resonator
Published: 5/21/2011
Authors: Jintao Zhang, H. Lin, X.J. Feng, J.P. Sun, Keith A Gillis, Michael R Moldover, Y.Y. Duan
Abstract: We used a single, fixed-path-length cylindrical-cavity resonator to measure {I}c{/I}^d0^ = (307.8252 {+ or -} 0.0012) m{bullet}s^u−1^, the zero-density limit of the speed of sound in pure argon at the temperature of the triple point of water. ...

9. Amplification of the optical absorption cross section for aerosols of soot with a nonabsorbing coating from photoacoustic measurements
Published: 5/13/2011
Authors: Pedro Bueno, Daniel K Havey, George William Mulholland, Joseph Terence Hodges, Keith A Gillis, Russell R Dickerson, Michael Russel Zachariah
Abstract: A quantitative understanding of the absorption and scattering properties of mixed soot and aerosol particles is necessary for evaluating the Earth‰s energy balance. Uncertainty in the net radiative forcing of atmospheric aerosols is relatively large ...

10. Characterization of Piezoelectric Ceramic Transducer for Accurate speed-of-Spound Measurement
Published: 7/30/2010
Authors: Keith A Gillis, Jintao Zhang, H. Lin
Abstract: In this paper, the piezoelectric ceramics mounted on the endplates of a cylindrical resonator were used as the source and detector for acoustic speed measurements. The perturbations of the longitudinal gas modes of the cavity due to the compliance of ...

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