Coriolis mass flow/density measuring devices and method for...

G - Physics – 01 – F

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G01F 1/84 (2006.01) G01F 1/74 (2006.01) G01F 15/02 (2006.01)

Patent

CA 2608007

The inline measuring device comprises a vibratory-type transducer and a measuring device electronics electrically coupled with the vibratory-type transducer. The vibratory-type transducer includes at least one measuring tube being inserted into the course of a pipeline and serving for conducting a mixture to be measured. An exciter arrangement acting on the measuring tube for causing the at least one measuring tube to vibrate and a sensor arrangement sensing vibrations of the at least one measuring tube and delivering at least one oscillation measurement signal representing oscillations of the measuring tube. The measuring device electronics delivers an excitation current driving the exciter arrangement. Further, the inline measuring device electronics is adapted to produce a measured value representing the physical, measured quantity of the mixture to be measured. Therefor, the measuring device electronics estimates from the excitation current and from said at least one oscillation measurement signal a Coriolis coupling coefficient. This Coriolis coupling coefficient corresponds with an instantaneous coupling between a first natural eigenmode of the measuring tube currently driven by the exciter arrangement and a second natural eigenmode of said measurement tube. In this second eigenmode the measurement tube has an eigenform corresponding with a mode of vibration caused by Coriolis forces induced in the flowing mixture. Due to a variation of a concentration of at least one of a component of the mixture the Coriolis coupling coefficient varies in time.

L'invention concerne un dispositif de mesure en ligne comprenant un transducteur de type vibrant, auquel est électriquement couplé un système électronique du dispositif de mesure. Le transducteur de type vibrant comporte au moins un tube de mesure inséré dans la ligne d'un conduit et servant au transport d'un mélange à mesurer. Un ensemble d'excitation agit sur le tube de mesure pour le faire vibrer et un ensemble de détection capte les vibrations du tube de mesure et envoie au moins un signal de mesure de vibration représentant les oscillations du tube de mesure. Le système électronique du dispositif de mesure fournit un courant d'excitation entraînant l'ensemble d'excitation. En outre, le système électronique du dispositif de mesure en ligne est conçu pour produire une valeur mesurée représentant la quantité mesurée physique du mélange à mesurer. Ainsi, le système électronique du dispositif de mesure évalue, à partir du courant d'excitation et du signal de mesure d'oscillation, un coefficient de couplage de Coriolis. Ce coefficient de couplage de Coriolis correspond à un couplage instantané entre un premier mode propre naturel du tube de mesure momentanément entraîné par l'ensemble d'excitation et un deuxième mode propre naturel du tube de mesure. Selon ce deuxième mode propre, le tube de mesure a une forme propre correspondant à un mode de vibration causé par les forces de Coriolis induites dans le mélange en écoulement. Une variation de la concentration d'au moins un composant du mélange fait varier le coefficient de couplage de Coriolis dans le temps.

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