Motion limitations of an acoustic holographic system utilizing a scanned linear array

This paper considers the motion limitations for a scanning acoustic holographic system. The system consists of a cylindrical insonifying antenna and a linear array of receivers perpendicular to the antenna. The reference signal for the system is electronic. Degradation in image quality results from a distortion of the holographic fringe pattern, rather than from blurring of the fringes. Uniform motion of a point source both parallel and perpendicular to the recording plane is treated first. The analysis and experiments are then extended to include insonified reflecting objects. The results show that in the special case of uniform translational motion, motion limitations are less restrictive than those encountered in conventional imaging systems with lenses. Nonuniformity of motion in a direction perpendicular to the receiving plane and rotation are shown to put stricter limitations on object motion.