Patent ID: 8073640

Claim:
A method for simultaneous determination of physical properties of a fluid utilizing an acoustic wave device (AWD) sensor having at least two resonant modes, said modes comprising predominantly horizontally polarized shear waves, comprising the steps of: measuring a transfer function of said AWD sensor over a frequency range of interest about at least two resonant frequencies corresponding to said at least two resonant modes; decomposing said measured transfer function into basis functions, each of said basis functions being descriptive of a specific resonance of said AWD sensor; and deriving said physical properties of said fluid from coefficients of said basis functions describing said measured transfer function of said AWD sensor, wherein at least one of said basis functions is further descriptive of finite-geometry fluid resonance, and wherein said at least one of said basis functions incorporates a frequency dependence of said measured transfer function deviating from a lumped element equivalent circuit.