Patent ID: 6704666
Filing Date: 2004-03-09
Classification: G01F,G01N

Abstract:
A method for determining properties of a flow tube and of a fluid flowing through said flow tube in response to receiving pickoff signals from a plurality of pickoffs associated with said flow tube, said pickoff signals indicating vibrations of said flow tube vibrated by a driver associated with said flow tube, said method comprising the steps of:a) receiving said pickoff signals from said plurality of pickoffs; b) determining a measured mode shape of said flow tube based on said pickoff signals; c) selecting values for flow tube and fluid parameters; d) determining an estimated mode shape of said flow tube based on said flow tube and fluid parameters; e) comparing said estimated mode shape to said measured mode shape to determine an error for said values for said flow tube and fluid parameters; and f) if said error for said values for said flow tube and fluid parameters is within an error range, then: determining said properties of said flow tube and of said fluid flowing through said flow tube based on said values for said flow tube and fluid parameters.