Abstract
The paper proposes algorithms for signals processing obtained by the multiple shadow method using Rayleigh waves propagating in the direction of the envelope pipe, and an electromagnetic-acoustic method of emission-reception. The results of a study of the sensitivity of the method to artificial and natural surface and near-surface defects of workpieces of drill pipes in two frequency ranges are presented. As informative parameters, it is proposed to use the multiple coefficient of detectability, as well as the probabilistic characteristics of dispersion, asymmetry and kurtosis in the analysis of a series of multiple passes, and the criteria for rejection are substantiated. The research results can be used in the development of automated installations and methods for monitoring pipes of small diameter.
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