Ihi Inspection and Instrumentation Co., Ltd.

Koki Daikoku

Shuichi Sato

Masato Yoshizaki

An L-mode guided wave sensorfor inspecting an inspection target by using an L-mode guided wave. The L-mode guided wave sensoris provided with a vibratorwhich is attached to an inspection target, and a coilwhich is wound around the vibratorand to which an AC voltage is applied. The vibratoris made of a ferromagnetic material.

L-mode guided wave sensor

(A) first data for defect amount estimation for the guided wave of a first frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (B) second data for defect amount estimation for the guided wave of a second frequency is obtained, the data indicating a relationship among amplitude of the reflected wave, a defect cross-sectional area and a defect width. (C) a guided wave of the first frequency is generated, and amplitude of a reflected wave is detected as first amplitude. (D) a guided wave of the second frequency is generated, and amplitude of a reflected wave is detected as second amplitude. (E) on a basis of the first and second data and the first and second amplitude, a defect cross-sectional area and a defect width of the defect part are estimated.

Testing method using guided wave

A testing method using a guided wave generates a guided wave to propagate through a subject as a testing target in a longitudinal direction of the subject, detects a reflected wave of the guided wave and examines the subject on the basis of the reflected wave. The testing method includes the steps of (A) obtaining data for defect amount estimation beforehand indicating a relationship between a defect amount of the subject and a magnitude of a reflected wave, (B) generating a guided wave so as to propagate through the subject, and detecting a reflected wave of the guided wave, and (C) estimating a defect amount of the subject on the basis of the data for defect amount estimation obtained at (A) and the magnitude of the guided wave detected at (B).

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Kanagawa, Japan

Koki Daikoku