Abstract
A first-order theory has previously been developed to allow the measurements of density and viscosity of fluids using the time-of-flight of torsional waves in immersed waveguides. In this article the theory has been modified to eliminate the need to calculate fluid-independent constants, via the use of two reference fluids. The effects of temperature differences among the reference and test fluids for moderately low temperatures are also examined. The result is a simple matrix equation which can be solved for the unknown fluid density. Fluid viscosity can be determined using an auxiliary equation.
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