Patent ID: 7360452
Filing Date: 2008-04-22
Classification: G01F

Abstract:
1. A method for measuring at least one parameter of a two-, or multi-phase mixture flowing in a pipeline, by means of an inline measuring device including a measurement transducer of the vibration-type, and measuring device electronics electrically coupled with said measurement transducer, said mixture consisting of at least one first mixture phase and at least one second mixture phase, said method comprising the steps of: conducting the mixture to be measured within at least one measuring tube of said measurement transducer, with the measuring tube being in communication with the pipeline; feeding an exciter arrangement with an excitation signal, said exciter arrangement being adapted to impart motion to said at least one measuring tube, said excitation signal including at least a first excitation signal component corresponding to a first one of a plurality of natural eigenmodes of said at least one measuring tube conducting said mixture; vibrating said at least one measuring tube within said first one of said plurality of natural eigenmodes and within a second one of said plurality of natural eigenmodes of said at least one measuring tube conducting said mixture, at least said second natural eigenmode being stimulated, at least partially, due to motions of at least one of said first and second mixture phase within said measuring tube relative to said measuring tube; sensing vibrations of the measuring tube conducting said mixture and generating at least one oscillation measurement signal representing oscillations of the vibrating measuring tube, said at least one oscillation measurement signal including at least a first measurement signal component corresponding to said first natural eigenmode of said at least one measuring tube conducting said mixture, and said at least one oscillation measurement signal including at least a second measurement signal component corresponding to said second one of said plurality of natural eigenmodes of said at least one measuring tube conducting said mixture; and using at least said first and second measurement signal components for generating at least one measured value representing said at least one parameter to be measured.