Structure Optimization of the Excitation Probe in Crack Rader Using Microwave
Grzegorz BYTNIEWSKI 佐々木 幸太 Kota SASAKI 遊佐 訓孝 Noritaka YUSA 橋爪 秀利 Hidetoshi HASHIZUME
Electromagnetic nondestructive inspectionMaintenancePipingProbe profileWall thinning
This paper reports the optimization of a new microwave probe for the nondestructive testing of an inner wall surface of the pipe, which is one of a novel long-range inspection. The method propagates a microwave inside a pipe to detect defects appearing the inner surface on the basis of the reflection of the microwave due to the defects. In order to propagate microwave into a pipe efficiently, the optimization based on the reflection and transmission characteristics at the probe obtained by the two-dimensional axial symmetry finite element simulations are carried out. Optimization results show that a probe with a semi-elliptic profile which has a tapered core wire with a rounded edge provides quite small reflection at the probe as well as much better single-mode propagation inside the pipe than conventional ones.