Investigation of the effect of a bend on pipe inspection using microwave NDT

Guanren Chen, Takuya Katagiri, Haicheng Song, Noritaka Yusa, Hidetoshi Hashizume

研究成果: Article査読

13 被引用数 (Scopus)


This study investigated the effect of a bend on microwave NDT (non-destructive testing) applied for rapid pipe inspections. The factors affecting the mode conversion of microwaves due to a bend were deducted theoretically and verified through numerical simulation. Both theoretical and numerical results revealed that the mode conversion at a bend was actually determined by the frequency normalized by the cut-off frequency of an arbitrary mode (f/fc), the ratio of the curvature radius to the inner diameter of the pipe (r/D) and the bend angle (α). Subsequent experimental evaluations were performed using four groups of pipes with different inner diameters and five different bends. The effect of a bend was quantitatively evaluated by comparing the reflection signals from pipe wall thinning in a straight pipe with those in a bent pipe. The results showed that the presence of a bend led to a decrease in the reflection signal behind the bend, and the extent of decrease also depended on r/D and α of the bend. Furthermore, the length or the depth of the pipe wall thinning did not noticeably affect the decrease in reflection signal, when the bend's dimensions were certain.

ジャーナルNDT and E International
出版ステータスPublished - 2020 3月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 機械工学


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