Abstract
The converted modes generated by mode conversion in guided waves-based inspection can provide plenty of defect information, and the reasonable usage of multiple wave modes can improve the results of defect inspection and evaluation. This paper focuses on the inter-conversion process of axisymmetric modes for incident longitudinal modes when interacting with the defects in pipeline whilst ignoring the converted non-axisymmetric modes through suppressing them in reception. This process is defined as symmetric mode conversion in this research. The pattern of axisymmetric mode sequence during symmetric conversion is identified and the method is proposed to extract the converted axisymmetric mode components for analysis. The relationships between the defect features and the modes generated in symmetric mode conversion under the excitation of longitudinal mode waves are investigated. The results show that longitudinal modes in symmetric mode conversion provide the potential for establishing an effective defect inspection.
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