A two-step real time acoustic imaging system is presented. The system incorporates a novel acoustic image coupler which transfers an acoustical interference pattern from a water-bounded to an air-bounded surface with vibration amplitude amplification. An original technique termed step-biased real time holographic interferometry is used to convert the amplified mechanical vibration pattern, which carries all information about the insonified object, into a visual image with improved sensitivity.
HanafyA. M., Acoustical Holography by Holographic Interferometry, Doctoral Dissertation, Chapter X, New Jersey Institute of Technology, Newark, NJ, 1977.
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