Effects of Phase-Cancellation on Scattering Measurements
Piezoelectric transducers are sensitive to the phase of the incident pressure. When measuring the transmission properties of inhomogeneous materials which distort the shape of the wave front, a substantive error results if a phase-sensitive transducer is used as a receiver due to the phase-cancellation effect. This artifact has been found also to exist for reflected and scattered waves. A computer model has been used to quantify the influence of this artifact on backscattered waves by examining the average pressure received by a phase-sensitive transducer for point, linear, rectangular, and random arrays and random volume distributions of scatterers as a function of transducer diameter, the distance between the transducer and the scatterers, and the number of scatterers, at several frequencies.