The determination of the viscoelastic properties of liquid materials at ultrasonic frequencies by CW mode impedance measurements

A method is described for measuring shear mechanical properties of liquids at ultrasonic frequencies. The method is based on the process of the electr ical impedance of a sensor in contact with the liquid, The sensor is compos ed of a piezoelectric transducer bonded to a delay line. The process determ ines the complex reflection coefficient of shear waves reflecting from the delay line-liquid interface, and the mechanical impedance is deduced. Exper imental determination of dynamic shear properties of a series of saccharose solutions is presented as an example of the method.