Sonic Pressure Vessel Sensor

[+] Author and Article Information
B. R. Tittmann

 The Pennsylvania State University, University Park, PA 16802

J. Pressure Vessel Technol 127(3), 226-229 (Feb 24, 2005) (4 pages) doi:10.1115/1.1990208 History: Received February 09, 2005; Revised February 24, 2005

A sensor method and apparatus are described for measuring the pressure of a gas within a sealed commercial pressure vessel mounted into an assembly. A sonic transducer is used to apply an oscillating force to the surface of a vessel. The frequency of the sonic wave is swept through a range which caused resonant vibrations of the gas in the vessel. A receiving transducer measures the amplitude of the resultant vibration at the vessel surface and reveals the resonant frequency of the gas at peaks in the amplitude of the sweep. The resonant frequency obtained depends upon the composition of the gas, its pressure and temperature and the shape of the confining vessels. These relationships can be predetermined empirically so that the pressure inside the vessel can be calculated when the composition of the gas, its temperature and shape of the confining vessel are known. The output of the receiver is fed into a computer which is programmed to calculate the pressure based upon these predetermined relationships which are stored in the computer.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Block diagram of instrumentation used to monitor resonances in both the free-standing vessel and the complete system

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Figure 2

Schematic illustration of the hardware used for the study of resonances in the free-standing bottle

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Figure 3

Broad-band resonance curve traces with helium gas at several different pressures within the free-standing bottle. Note the shift in the frequency of the resonance with changes in pressure.

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Figure 4

Frequency-pressure calibration curves at several different temperatures

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Figure 5

Broad-band sweep of resonances of the complete system at frequencies between 0Hz and 15000Hz. Arrow points to gas resonance peak.

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Figure 6

Trace of resonant vibrations between 3500Hz and 4500Hz, the window of interest for a gas pressure sensor



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