Sensitive sound field parameters for the characterization of viscous fluids

Conventionally analysis of damping measurements assuming plane waves without considering the shape of the sound field lead to wrong damping coefficients. In this study, it is shown that the received signal strongly depends on the type and shape of the reflector, the applied transducer and sample medium and therefore the dependence of focus position and spectral distribution from sound velocity and damping is discussed. For instance, a change of the focal position between a nearly "nondamped" and damped media was observed.