Abstract
The resonant frequency of a piezoelectric crystal was determined by transmission measurements. The simple principle of this resonance method is that a transmission is measured at varying frequencies with a two-port transmission line system containing parallel resistance. Previous workers formulated the resonant frequency of a quartz crystal and the equation derived indicated that the frequency is dependent on (ρη) 1 2 and F 3 2 b, where ρ, η and F b are the density and viscosity of the solution and the fundamental frequency of the quartz crystal, respectively. The resonance method was applied to solutions of varying (ρη) 1 2 , and it is concluded that the equation holds for a wide range of different solutions. The resonance method is advantageous in solutions over the widely used conventional oscillation method because the range of (ρη) 1 2 for possible measurements is much wider.
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