SENSOR, SYSTEM AND METHOD FOR MEASURING FLUID PROPERTIES USING MULTI-MODE QUASI - SHEAR - HORIZONTAL RESONATOR Russian patent published in 2012 - IPC G01N29/02 

FIELD: physics.

SUBSTANCE: when measuring at least two fluid properties selected from density, viscosity and modulus of elasticity, when the third of said fluid properties is known or assumed, the following steps are carried out: providing a Multi Mode Quasi Shear Horizontal Resonator (MMQSHR) having an energy input, and a measuring surface for contact with said fluid, said measuring surface having at least a first region and a second region, and a separation area defined in between; exciting said MMQSHR with excitation energy via said input, at a first and a second frequency selected to excite a first and a second acoustic mode respectively. Each of said acoustic modes causes a component of horizontal shear wave motion in said surface, wherein excitation at said first frequency further causes said regions to move in phase relative to each other; and excitation at said second frequency causes said two regions to move out of phase relative to each other, inducing a vertical displacement in said separation area; measuring energy related parameters at said first mode and second mode; calculating two of said fluid properties utilising said energy related parameters and information relating to said third fluid property.

EFFECT: possibility of determining two or three parameters when the third parameter is unknown.

23 cl, 14 dwg