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《Journal of Applied Acoustics》 2019-06
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Instantaneous phase envelope imaging and compensation in aluminum plate using array of Lamb waves

FAN Jiawei;LI Guanghai;WANG Qiang;College of Quality and Safety Engineering, China Jiliang University;China Special Equipment Inspection and Research Institute;  
Aiming at the problem of the identification and location of multi-crack in the plate structure, an envelope algorithm for instantaneous phase total focus imaging and a velocity compensation method based on the pulse duration of the excitation signal are proposed. The ability of identifying and locating multicrack by instantaneous phase envelope total focus imaging after velocity compensation is verified by numerical simulation and experiment. The results show that compared with amplitude total focus imaging, this method can effectively reduce the virtual image caused by noise, direct wave and end echo, and improve the recognition rate of defects. Compared with phase total focus imaging, this method can achieve single-peak focusing at the defect and facilitate the positioning of defects. Five defects are imaged and located on the aluminum plate using the imaging algorithm and the average error of the location was 12.24 mm.
【Fund】: 国家重点研发计划项目(2016YFF0203002)
【CateGory Index】: TG115.28
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