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Ultrasonic tomography for measurement of thickness of hardened layer on steel shafts

The idea for this project was created, based on the inquire of a producer of automobile parts, that have cylindic shape and hardened near-surface layer. Literature study and measurements have shown, that the difference between sound speed in hardened and not hardened steel is not large, but enough to design a tomographic ultrasonic device, that will be able to measure the thickness of such layer and its hardness with fully sufficient precision. This would be large improvement in comparison to existing methods, that allows testing of such shafts (and other partially hardened parts only with destructive methods.

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