INSPECTION METHOD OF IRON-BASED STRUCTURE, AND MAGNETIC IMPEDANCE EFFECT SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a method for accurately and easily inspecting an iron-based structure with a magnetic impedance effect sensor. SOLUTION: A sensor having a magnetic impedance effect element is moved along the iron-based structure while the exciting current is carried to the magnetic impedance effect element and bias magnetic field obtained by superimposing an alternating current component on a direct current component. The iron-based structure serves as part of a magnetic circuit with respect to the bias magnetic field, the intensity of the bias magnetic field varies according to the degree of a flaw/corrosion/thickness reduction of the iron-based structure, and the degree of a defect of the iron-based structure is inspected according to the output variation. COPYRIGHT: (C)2007,JPO&INPIT