Effects of Phase-Cancellation on Scattering Measurements

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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.

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