Experimental estimation of acoustic attenuation and dispersion

In the research of methods for evaluation and characterization of therapy ultrasound transducers that will be used in the hyperthermia applications, the measurement of some acoustic parameters is especially important. We have used a modified broadband through-transmission technique proposed by Ping He (1999) for measuring acoustic dispersion and attenuation because it requires a minimum number of variables to be measured and eliminates the needs for measuring the speed of sound in the water and the trigger delays in data sampling. In addition it minimizes the uncertainty in determining the phase spectra. Unfortunately we have found some inconvenient aspects of this technique in our application.