Direct Measurement of High-Pressure Gas Density With an Ion-Chamber Densitometer

[+] Author and Article Information
B. W. Friar

Wright State University, Dayton, Ohio

D. D. Glower, S. M. Marco

The Ohio State University, Columbus, Ohio

J. Fluids Eng 97(1), 71-77 (Mar 01, 1975) (7 pages) doi:10.1115/1.3447219 History: Received August 14, 1974; Online October 12, 2010


The dependence of ion-chamber current on the density of the filling gas has been investigated, experimentally and analytically, to explore the use of an ion chamber as a high-pressure gas densitometer. A flat-plate ion chamber with a self-contained beta-particle source (Sr90 -Y90 ) was used in experiments with methane, nitrogen, and carbon dioxide and for pressures up to 2000 psia and densities up to 9 lbm/ft3 . Over an appreciable density range, the linearity of the current-density response was good with a static sensitivity of about 10−10 amp/(lbm/ft3 ) and a reproducibility of ±0.5 percent. Variables which could be used to increase the static sensitivity and the linear range were identified.

Copyright © 1975 by ASME
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