Eddy current measuring sensor and inspection method using this eddy current measuring sensor

摘要

An eddy current measuring probe sensor has an exciting portion and a detecting portion. The exciting portion includes a primary exciting portion that includes a main core formed of a cylindrical magnetic body and a main coil that is a solenoid coil wound in a circumferential direction around the main core, and a plurality of secondary exciting portions that include sub-cores formed of cylindrical magnetic bodies that are arranged around the primary exciting portion in a manner such that an axial direction of each of the sub-cores is the same as an axial direction of the main core. The plurality of secondary exciting portions are configured to be able to change the position of each sub-core independently in the axial direction relative to the primary exciting portion.