Abstract
Abstract : A two dimensional acoustic imaging device, with electronic focusing and scanning in both directions was constructed. The device is designed to work with 2.25 MHz acoustic waves. It employs M piezoelectric elements in a transmitting transducer, which produce a beam focused and scanned in the y direction. An N element receiving transducer is used to focus and scan in the x direction. This makes it possible to obtain M by N resolvable spots with only M plus N elements, a considerable saving in complexity. The phase reference for the transmitter and receiver are supplied by frequency modulated chirp signals sent along acoustic surface wave delay lines. One of the novel features of this device is the ability to obtain an arbitrary scan velocity, even a stationary focus, with the transmitter.
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