Patent ID: 7914203

Claim:
A method for measuring at least two physical parameters in an environment comprising at least one of a gas and a liquid, the method comprising: providing a piezoelectric bimorph cantilever comprising at least a first layer, a piezoelectric layer, and two electrodes; placing the piezoelectric bimorph cantilever in the environment; vibrating the piezoelectric bimorph cantilever, wherein vibrating the piezoelectric bimorph cantilever comprises applying an AC voltage across the two electrodes; determining the resonant frequencies of at least two resonance modes of the piezoelectric bimorph cantilever, wherein applying the AC voltage across the two electrodes and determining the resonant frequency of the at least two resonance modes of the piezoelectric bimorph cantilever is achieved with an impedance analyzer; and determining at least two physical parameters of the environment, each based on a combination of resonant frequencies of the at least two resonance modes.