By developing the principle of a usual vibrating-plate-viscometer
1), this industrial visco-elasticity-meter has been made. In certain condition the mechanical impedance
Z of a flat plate immersed in a liquid and vibrating in its own plane is proportional to the viscoelasticity or complex rigidity
G=E+jωη, and therefore the measurement of viscoelasticity is reduced to the separation of the real part and the imaginary part of
Z.
In this instrument the real part and the imaginary part of the voltage proportional to
Z is separated and indicated as deflections of two ammeters, one of which, then, indicates viscosity of the liquid to be measured, and the other indicates rigidity.
Values of the viscosity and the rigidity of several liquids (polyisobutylene, millet-jelly and glycerin) are calculated from experimental data and theoretical equation on the assumption that this viscoelasticity-meter is an absolute measuring-instrument.
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