Method and apparatus for determining the contents of a gas bottle
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United States of America Patent
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Jun 19, 2001
Grant Date -
N/A
app pub date -
May 11, 1999
filing date -
Sep 26, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method for determining the contents of a gas bottle, in particular a liquid gas bottle, comprising the following steps: First of all, the gas bottle is excited by applying a signal to a loudspeaker mounted on said gas bottle. The signal from a microphone mounted on the gas bottle is compared in phase with the signal used for excitation, with the frequency of the signal applied to said loudspeaker being altered continuously, until a resonant frequency is established. This resonant frequency is converted into a filling level of the gas bottle according to a previously determined relationship between the resonant frequency and the filling level. Furthermore, an apparatus is disclosed with which the above-mentioned method may be put into practice.
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