Data Acquisition System for Computer Aided Coherent Acoustic Imaging
A coherent acoustical imaging is under design and test. This system utilizes precisely spaced samples of the amplitude and phase of an ultrasonic field as data input for the computer processing and display sub-system. Two designs of the data acquisition system are described: one a raster scan and the other a single sweep of a linear array. Design goals are to achieve a 256 × 256 array of amplitude and phase data recorded on a digital cassette recorder. Both techniques use microprocessor control of the data flow and sampling. The relatively slow motion of the raster scan presents few problems in achieving results and control was easily implemented with an 8748 microprocessor. The speed requirement in sampling, measuring and converting the data in the linear array case however present a more difficult challenge requiring a more complex microprocessor system described in detail in the paper.
KeywordsLinear Array Phase Detector Ultrasonic Field Naval Postgraduate School Microprocessor System
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