Ultrasonic transducer array tomography for detecting defect of metal plate based on Hilbert transformation 被引量：1

Ultrasonic transducer array tomography for detecting defect of metal plate based on Hilbert transformation

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摘要 Hilbert transformation and improved ellipse localization method is applied in ultrasonic transducer array tomography to detect defect of metal plate.By combining the improved ellipse localization method and time-reversal method,the new ultrasonic tomography algorithm employs smooth Hilbert envelope instead of discrete amplitude to reconstruct defect image.An ultrasonic tomography system with six transducers is built to evaluate the effectiveness of the new ultrasonic tomography algorithm.The S0 mode Lamb wave is excited on special condition,and the mode of received signal is identified by Vigner-Wille distribution.The gray value of image area is defined by envelope of the reflected S0 mode Lamb wave signal from defect boundary.Defect image can be reconstructed by summing gray value of all pixels in the image area.The experimentally reconstructed defect image shows that the new tomography algorithm based on Hilbert transformation is efficient for defect detection in metal plate. Hilbert transformation and improved ellipse localization method is applied in ultrasonic transducer array tomography to detect defect of metal plate.By combining the improved ellipse localization method and time-reversal method,the new ultrasonic tomography algorithm employs smooth Hilbert envelope instead of discrete amplitude to reconstruct defect image.An ultrasonic tomography system with six transducers is built to evaluate the effectiveness of the new ultrasonic tomography algorithm.The S0 mode Lamb wave is excited on special condition,and the mode of received signal is identified by Vigner-Wille distribution.The gray value of image area is defined by envelope of the reflected S0 mode Lamb wave signal from defect boundary.Defect image can be reconstructed by summing gray value of all pixels in the image area.The experimentally reconstructed defect image shows that the new tomography algorithm based on Hilbert transformation is efficient for defect detection in metal plate.

作者许寒晖徐春广张运涛刘龙

机构地区 School of Mechanical Engineering Patent examination cooperation center of SIPO

出处《Journal of Beijing Institute of Technology》 EI CAS 2011年第4期514-519,共6页 北京理工大学学报（英文版）

基金 Supported by the National Natural Science Foundation of China(50975028) "111"Project of China(B08043)

关键词 Lamb wave transducer array Hilbert transformation TOMOGRAPHY Lamb wave transducer array Hilbert transformation tomography

分类号 TG115.285 [金属学及工艺—物理冶金]

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