Patent ID: 7954388
Filing Date: 2011-06-07
Classification: G01F

Abstract:
1. An in line measuring device, especially a Coriolis mass flow/density measuring device and/or a Coriolis mass flow/viscosity measuring device, for a flowable medium, especially a medium which is, at least at times, two- or multiphase and/or which contains impurities, such as, for instance, gas bubbles and/or solid particles, which in line measuring device comprises: a measuring transducer of vibration-type, having at least one measuring tube vibrating, at least at times, during operation, especially performing bending oscillations, and serving for conveying flowable medium, especially medium which is, at least at times, two- or multiphase and/or which contains impurities, an exciter mechanism acting on said measuring tube, especially an exciter mechanism acting centrally on said measuring tube, for producing vibrations, especially bending oscillations, of said at least one measuring tube, and a sensor arrangement for registering vibrations, especially bending oscillations, of said at least one measuring tube, which delivers at least one oscillation measurement signal representing oscillations, especially bending oscillations, of said measuring tube; and measuring device electronics electrically coupled with said measuring transducer, which at least at times, delivers at least one exciter signal, especially an exciter signal having a periodically variable and/or impressed electrical current, driving said exciter mechanism, and at least at times, during operation, ascertains a damping value of first type, especially by means of said at least one oscillation measurement signal and/or by means of said at least one exciter signal, especially periodically and/or, with a predetermined updating rate recurringly, ascertains a damping value of a first type, which represents, instantaneously, an antisymmetric damping of vibrations of the at least one measuring tube induced by medium conveyed in said at least one measuring tube, especially antisymmetric damping corresponding to a spatial distribution of inhomogeneities, such as, for instance, gas bubbles and/or solid particles, in the medium flowing through said at least one measuring tube and/or influencing a phase difference between said at least one oscillation measurement signal and at least one exciter signal, and antisymmetric with reference to an imaginary central plane of said at least one measuring tube coplanar with a cross section of the measuring tube, and/or represents, instantaneously, a change with respect to time of a damping of vibrations of said at least one measuring tube induced by medium conveyed in the at least one measuring tube, especially a change with respect to time of a damping of vibrations corresponding to a flow velocity of the medium and/or associated with a change of a spatial distribution of inhomogeneities within the medium located in said at least one measuring tube, especially a damping symmetric as regards an imaginary central plane of said at least one measuring tube coplanar with a cross section of the measuring tube and/or ascertained on the basis of said at least one oscillation measurement signal and/or on the basis of said at least one exciter signal.