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Imaging of Nonaxisymmetric Area Discontinuities in Pipes Using Guided Wave Synthetic Focusing

The corrosion discontinuities that cause thickness loss in arbitrarily shaped areas are one of the major health problems for long-term operating pipes. In this paper, the guided wave synthetic focusing technique and deconvolution algorithm are used to reconstruct the images of area discontinuities in pipes. Firstly, the feasibility of this imaging technique is verified by numerical simulation. Two kinds of nonaxisymmetric area discontinuities are imaged: those with uniform thickness loss and those with progressive thickness loss. The axial length of an area discontinuity with uniform thickness loss can be quantitatively determined from the reconstructed image. As for the disconti-nuities with progressive thickness loss, the essential condition for guided wave reflection is the saltation of thickness-varying gradient. Secondly, the slices attached on the pipe and a scratch upon the pipe surface were imaged by experiment. The reconstructed discontinuity images successfully located the discontinuities and presented the discontinuities’ thickness-variation features.


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