Noninvasive characterization of a flowing multiphase fluid...

G - Physics – 01 – N

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G01N 29/036 (2006.01) G01F 1/66 (2006.01) G01N 29/32 (2006.01) G01N 29/028 (2006.01)

Patent

CA 2490871

An apparatus for noninvasively monitoring the flow and/or the composition of a flowing liquid using ultrasound is described. The position of the resonance peaks for a fluid excited by a swept-frequency ultrasonic signal have been found to change frequency both in response to a change in composition and in response to a change in the flow velocity thereof. Additionally, the distance between successive resonance peaks does not change as a function of flow, but rather in response to a change in composition. Thus, a measurement of both parameters (resonance position and resonance spacing), once calibrated, permits the simultaneous determination of flow rate and composition using the apparatus and method of the present invention.

L'invention concerne un appareil permettant de surveiller de manière non invasive l'écoulement et/ou la composition d'un liquide d'écoulement à l'aide d'ultrasons. On a découvert que la position des pics de résonance d'un fluide excité par un signal ultrasonore à balayage en fréquence modifiait la fréquence à la fois en réponse à un changement de composition et en réponse à un changement de débit d'écoulement. En outre, la distance entre des pics de résonance successifs ne change pas en tant que fonction d'écoulement, mais plutôt en réponse à un changement de composition. De ce fait, une mesure de deux paramètres (position de résonance et espacement de résonance), une fois étalonnée, permet de déterminer simultanément le débit et la composition à l'aide de l'appareil et du procédé de l'invention.

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