Compensation method of propagating distance for guided wave


Guided wave has been utilised in various manners for non-destructive evaluation and testing. The dispersion and attenuation characteristics of guided wave restrict and complicate the accurate estimation of echo propagation distance. The study focuses on how to reduce the estimation error of propagation distance caused by these characteristics. The propagation of guided wave with attenuation and dispersion characteristics is analytically modelled in general cases. The flight-time compensation technique is developed based on the analytical model of wave propagation and the algorithm of chirplet matching pursuit. Numerical simulations are given to verify the efficacy of the developed compensation method. Finally, this study demonstrates the use of experimentally measured data for echoes identification and propagation distance estimation.

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