Viscosity and Density Measurements
نویسنده
چکیده
2. Working Equations of the Vibrating-Wire Instrument Our implementation [1] of the steady-state vibrating-wire technique is similar to that described by Audonnet and Pádua [2] in which the wire is driven at frequency f by a constant sinusoidal current I, and the emf V(f) generated across the vibrating wire is measured with a two-phase lock-in amplifier. This measured emf generally comprises two terms: the first, V1(f), arises from the electrical impedance of the stationary wire; while the second, V2(f), arises from the motion of the wire. In the analysis, we express the complex function V1 as
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