Method of determining sound propagation
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United States of America Patent
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-
Oct 30, 1984
Grant Date -
N/A
app pub date -
Dec 28, 1981
filing date -
Dec 30, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of and an apparatus for determining sound propagation speed in a medium which is subject to variations in this speed. A measuring tube containing the medium is energized by a loudspeaker (ultraacoustic transducers) with a controllable energizing frequency in resonance with the measuring tube containing a column of the medium to be evaluated. The resonant output frequency is detected and modulated with a low frequency signal and the mean value of the modulated output signal is formed and counted. For a predetermined count, the elapsed time is measured and from this value the propagation velocity is calculated.
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