G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 1/66 (2006.01)
Patent
CA 2268049
The invention concerns a fluid meter (10) comprising ultrasonic transducers (26, 28), means for attenuating parasitic ultrasonic waves, of wavelength .lambda., constituted by at least one passage (36, 38, 40) in which said waves propagate along a main direction corresponding to a longitudinal dimension (a) of said passage, said passage having a transversal dimension (b) perpendicular to (a) and much less than the wavelength .lambda. of the parasitic waves in the propagating medium, said passage comprising a plurality of consecutive passage portions (46, 48) each having a part (46) with a reduction of the transversal cross-section of the passage along the dimension (b) of the passage, the longitudinal dimension of each passage portion being substantially equal to .lambda./2.
L'invention a pour objet un compteur (10) de fluide comprenant des transducteurs ultrasonores (26, 28), des moyens d'atténuation d'ondes ultrasonores parasites, de longueur d'onde .lambda., constitués par au moins un passage (36, 38, 40) dans lequel lesdites ondes se propagent suivant une direction principale correspondant à une dimension longitudinale (a) dudit passage, ledit passage ayant une dimension transversale (b) perpendiculaire à (a) et très inférieure à la longueur d'onde .lambda. des ondes parasites dans le milieu de propagation, ledit passage compenant une pluralité de portions de passage consécutives (46, 48) ayant chacune une partie (46) qui présente une réduction de la section de passage transversale suivant la dimension (b) du passage, la dimension longitudinale de chaque portion de passage étant sensiblement égale à .lambda./2.
Froelich Benoit
Hocquet Philippe
Lavrut Eric
Schlumberger Industries S.a.
Smart & Biggar
LandOfFree
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