Long-range inspection of a pipe with a bend using microwaves

Shoya Uoshita, Kota Sasaki, Takuya Katagiri, Noritaka Yusa, Hidetoshi Hashizume

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This study evaluated the effect of bends on the long-range nondestructive testing inspection of pipe surfaces based on microwaves propagating inside the pipe. Three-dimensional finite element simulations were conducted to reveal electromagnetic fields at bends with a diameter of 23 mm and various radii of curvature when microwaves were emitted into a pipe in the TM 01 mode that had been mainly used in earlier studies. The simulations revealed that the effect of the bend on the microwaves is not significant when the ratio of curvature is larger than approximately 2, whereas in general a bend reflects a part of microwaves and causes non-TM 01 modes. Subsequent experimental verifications, which used a pipe with a total length of approximately 4 m and a 90-degree or 180-degree bend, confirmed clear reflections due to artificial wall thinning in spite of the presence of the bend.

Original languageEnglish
Pages (from-to)1519-1526
Number of pages8
JournalInternational Journal of Applied Electromagnetics and Mechanics
Issue number4
Publication statusPublished - 2019


  • Electromagnetic nondestructive evaluation
  • electromagnetic wave
  • finite element simulation
  • pipe degradation
  • time of flight
  • wall thinning


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