Digital Synthetic-Aperture Acoustic Imaging System

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1980-07-01
Authors
Corl, Doug
Kino, Gordon
Behar, D
Olaisen, H.
Titchener, P.
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Abstract

A real-time 32-element synthetic aperture acoustic imaging system has been developed. We can test new ideas for the system by using an acoustic array and carrying out image reconstruction on a computer. Contour plots of simple images are shown to illustrate the resolution (0.4 - 0.5 mm in range and transverse resolution) and sidelobe levels obtained with this synthetic-aperture technique. Rayleigh wave images of surface cracks and holes in metal samples have been obtained and a new type of monolithic edgebonded acoustic transducer array has been developed for use in Rayleigh wave imaging. A number of techniques for reducing the sidelobe levels and improving the resolution have been investigated. The results obtained with a new 32-tap digital delay line for deconvolving the pulse response of a transducer in real time are described.

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Tue Jan 01 00:00:00 UTC 1980
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