Spacing of transducer-elements in transmitter and receiver arrays to collect data for ultrasonic diffraction tomography.

Abstract

We discuss the spacing of the transducer elements of transmitter and receiver arrays to sample sufficient data for ultrasonic diffraction tomography. We intend to save fairly the data acquisition time of our prior method by replacing the mechanical scanning of the pair of a transmitter and a receiver with the electrical switching of the both arrays. One of the most important parameters of the arrays is the spacing of the elements. In the previous paper we used the equation of the spacing derived from the theory of acoustical holography for convenience, though the prerequisites might not fit for the case. We now newly obtain the equation by calculating the phase of the received signal. New result proves 3 times narrower than the previous one. We confirm the feasibility of the new result by the numerical calculation and the experiment.