Houtteman Law LLC
Method for detecting defect of metal plate
A method for detecting a defect of a metal plate includes selecting N controllable emitting electromagnetic acoustic transducers EMATs as excitation transducers, and selecting M omnidirectionally receiving EMATs as receiving transducers, exciting an ultrasonic guided wave in a metal plate by a nth controllable emitting EMAT with a predetermined emission angle; determining whether each of M1 omnidirectionally receiving EMATs and the nth controllable emitting EMAT form a scattering group; for the scattering group, solving a position of a scattering point and a direction of a scattering side according to a distance between Tn and Rml, the emission angle and a travel time of the ultrasonic guided wave; performing a curve fitting on all the scattering points in directions of respective scattering sides to obtain a contour image of the defect.
TSINGHUA UNIVERSITY EDDYSUN (XIAMEN) ELECTRONIC CO., LTD. CHINA SPECIAL EQUIPMENT INSPECTION AND RESEARCH INSTITUTE HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY HUBEI UNIVERSITY OF TECHNOLOGY
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G01N G01N G10K G01N G01N G01N G01N G01N G01N G01N
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Wei Gongtian Shen Yihua Songling Junming Yu Xiaochun
Zhao Shen Wang Kang Huang Lin Zhang Song