Quantitative Ultrasonic Tomographic Imaging
نویسندگان
چکیده
An ultrasonic transmission technique is described which images the velocity variation within metal parts. The arrival time of the first ultrasonic pulse to traverse the object is detected and displayed as a gray scale on a cathode ray tube while the part is being scannerJ hori:tontally and vertically. The velocity variation imaged within severa 1 cast turbine parts will be shown. ihe system can detect voids as small as 0.020 inch. With a more complex computer program and knowing IJ!e dimensions of the part, tomographic reconstruction of the velocity variation within parts with curved surfaces should be possible.
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