Measuring and testing – Gas analysis – By vibration
Patent
1991-02-19
1992-11-03
Williams, Hezron E.
Measuring and testing
Gas analysis
By vibration
73 2406, 73 2401, G01N 2900, G01N 2922
Patent
active
051598434
ABSTRACT:
Density measurements can be made in a gas contained in a flow through enclosure by measuring the sound pressure level at a receiver or microphone located near a dipole sound source which is driven at constant velocity amplitude at low frequencies. Analytical results, which are provided in terms of geometrical parameters, wave numbers and sound source type for systems of this invention, agree well with published data. The relatively simple designs feature a transmitter transducer at the closed end of a small tube and a receiver transducer on the circumference of the small tube located a small distance away from the transmitter. The transmitter should be a dipole operated at low frequency with the kL value preferably less than about 0.3.
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patent: 3762197 (1973-10-01), Roof et al.
patent: 3789655 (1974-02-01), Passeri
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E. N. Haran, Rev. Sci. Instrum. 59,2059 (1988).
L. P. Landau and E. M. Lifshitz, Fluid Mechanics, Pergamon Press, London.
Back Lloyd
Kwack Eug Y.
Shakkottai Parthasarathy
Brock Michael J.
Jones Thomas H.
Manning John R.
Miller Guy M.
The United States of America as represented by the Administrator
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