Patent ID: 7878044
Filing Date: 2011-02-01
Classification: G01N

Abstract:
1. A method of measuring at least two fluid properties selected from density, viscosity, and elastic modulus, when the third of said fluid properties is known or assumed, the method comprising the steps of: providing a Multi Mode Quasi Shear Horizontal Resonator (MMQSHR) having an energy input, and a measuring surface for contacting said fluid, said measuring surface having at least a first region and a second region, and a separation area defined therebetween; feeding said MMQSHR with excitation energy via said input, at a first frequency and then at a second frequencies selected to excite a first and a second acoustic modes respectively, each of said acoustic modes causing a component of horizontal shear wave motion in said surface, measuring energy related parameters at said first mode and second mode; calculating two of said fluid properties utilizing said energy related parameters and information relating to said third fluid property.