For an elastic coated cylinder, the dispersive properties of surface waves are analyzed theoretically, and the dispersive curves are calculated numerically. The surface waves propagated along the surface of a steel cylinder coated with zinc are generated and detected by a laser ultrasonic system, and its dispersive properties are analyzed and calculated by phase spectrum method. In order to characterize coating parameters effectively, their influence on dispersive curve of surface waves are first analyzed, the results show that the dispersive curve of surface waves is sensitive to the variance of coating parameters, especially velocity of shear wave and thickness. Based on these results, the optimization arithmetic, Powell method is used to inverse coating parameters. The results obtained by using numerical simulated signals show a good precision, and the experimental signals are used to inverse and estimate coating parameters further.
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