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概要

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.

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