Ultrasound transducer sensitivity in non linear parameter measurement

We present a procedure for measurement of the non linear B/A parameter using a simple comparative method. A theoretical model of the measurement system is proposed. A function sensitivity of the system is derived in order to connect the electric and acoustic magnitudes. Thus the optimal conditions in order to avoid complex calculation of the transducers sensitivities were carried out. We showed that the sensitivity function of the measurement system can be kept close to the unit by making a good choice of the fundamental frequency. Indeed if the frequency of the source transducer is chosen less than the resonance frequency we can avoid determining the sensitivities. Measurements had been carried out to validate the procedure and the theoretical aspects.