An ultrasonic phased array system for NDT of steel structures
PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)(2005)
摘要
A phased array ultrasonic inspection system is being developed to obtain electronically scanned ultrasonic images of the inside of steel structures for nondestructive evaluation. This phased array ultrasonic inspection system is made up of computer, scanner, motion controller, motor driver, ultrasonic emission, receiving & delay circuit, high speed data acquisition circuit and ultrasonic phased array transducer, this system has the functions of controlling ultrasonic transmission and receiving, controlling sound wave steering and focusing, controlling scanner moving, receiving position information and flaw information, restructuring flaw image. Experimental tests were done on a steel testing block with side-drilled holes to simulate defects. The side-drilled holes could be detected and their diameters could be estimated from B-Scan image, the B-scan image could show the location of side drilled holes clearly and does not have any ghost image.
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关键词
NDT,ultrasonic inspection,phased array,transducer,steel structures
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