Ultrasonic fluid meter with improved resistance to parasitic ultrasound waves
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United States of America Patent
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Mar 4, 2003
Grant Date -
N/A
app pub date -
Apr 27, 1999
filing date -
Oct 28, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention provides a fluid meter comprising ultrasound transducers, attenuation means for attenuating parasitic ultrasound waves of wavelength .lambda., and constituted by at least one passage in which said waves propagate along a main direction corresponding to a longitudinal dimension a of said passage, said passage having a transverse dimension b perpendicular to a and much smaller than the wavelength .lambda. of the parasitic waves in the propagation medium, said passage comprising a plurality of consecutive passage portions each having a part presenting a reduction in transverse propagation section along the dimension b of the passage, the longitudinal dimension of each passage portion being substantially equal to .lambda./2.
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