Linear Receiving Array for Acoustic Imaging and Holography
A hydroacoustic receiver intended for use in ultrasonic imaging and holography is described. An experimental model contains a 16-element rectilinear array of PZT transducers. Voltage output of each element at 2.1 MHz is amplified separately to a level at which acoustic sensitivity is limited by amplifier noise rather than by switching transients of the multiplex circuit. Amplifier outputs are sampled sequentially by the multiplexer at a rate of 8000 elements/second to produce one line of video information. Acoustic images in nondestructive test and medical applications are obtained by translating or rotating either the array or the test specimen. Utilization of such array for ultrasonic visualization in nondestructive testing is discussed, and methods for receiver miniaturization by use of hybrid-circuit techniques are proposed.
KeywordsNondestructive Test Linear Array Automatic Gain Control Acoustic Imaging Acceptance Angle
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