C103 分散補償法によるクラックレーダーの高性能化(OS6 亀裂検査および溶接技術)

概要

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This study proposes a signal processing method that significantly enhances the nondestructive evaluation of flaws appearing inside pipe wall from the reflection of microwaves propagating inside the pipe. The signal processing method modifies the phase of incident microwave as a function of frequency so that the reflection due to an anomaly at a certain distance is observed as a pulse. Validations are carried out both by experiments and finite element simulations using a straight brass pipe with a outer diameter of 25mm and a wall thickness of 3mm. This study considered wall thinning artificially introduced into the inner surface of the pipe. The results of the validations demonstrate the effectiveness of the signal processing method even when wall thinning have a complicated boundary profile.
一般社団法人日本機械学会の論文
2011-06-22