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The principles of different acoustic testing methods are shown in (A), (B) and (C). Emitted sound waves are blue, reflected sound waves red. (D), (E) and (F) show tools for the different inspection methods. (D) Shows a fix mounted UT thickness gauge (courtesy of Blueye Robotics), (E) shows a ROV operated GUWT tool (courtesy of Guided Ultrasonic Ltd.) and (F) shows a ROV deployed crawler with incorporated TOFD scanner (courtesy of Sonomatic).
