Abstract
A preliminary version of an ultrasonic imaging system with capability of two dimensional coherent data processing and computer image processing has been built and tested. The system consists of two parts: data acquisition, and computer processing and display. The data acquisition system detects and records the coherent ultrasonic diffraction pattern emitted from or reflected by an object. This pattern is then quantized and entered into the computer memory. The computer portion processes the data and displays the resulting image on a high resolution computer controlled graphics terminal. The use of coherent detection offers advantages in that coherent processing techniques as well as incoherent techniques can be used to obtain an optimal image. Such operations as matched filtering, removal of the receiver transducer’s directivity pattern, edge enhancement, etc. are easily performed. Applications of the system to ultrasonic imaging, acoustic transducer calibration and studies of scalar wave propagation will be discussed.KeywordsPhase DetectorNaval Postgraduate SchoolAmplitude DetectorComputer Image ProcessingAcoustical HolographyThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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