Resonator/Oscillator Response to Liquid Loading

摘要

The resonant frequency of a thickness-shear mode reso- nator operated in contact with a fluid was measured with a network analyzer and with an oscillator circuit. The network analyzer measures changes in the device's in- trinsic resonant frequency, which varies linearly with (ρη)~1/2, where ρ and η are liquid density and viscosity, respectively. The resonator/oscillator combination, how- ever, responds differently to liquid loading than the resonator alone.