Abstract
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 language | English |
|---|---|
| Pages (from-to) | 1519-1526 |
| Number of pages | 8 |
| Journal | International Journal of Applied Electromagnetics and Mechanics |
| Volume | 59 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2019 Jan 1 |
Keywords
- Electromagnetic nondestructive evaluation
- electromagnetic wave
- finite element simulation
- pipe degradation
- time of flight
- wall thinning
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering