eddy current measurement sensor and inspection method using eddy current measurement sensor.

摘要

eddy current measurement sensor and inspection method using eddy current measurement sensor. a eddy current measurement test sensor (100) has an excitation part (20) and a detection part (30). the excitation part (20) includes a primary excitation part which includes a main core (21) formed of a cylindrical magical body and a main coil (22) which is a solenoid coil wound in a circumferential direction in around the main core (21), and various secondary excitation parts including sub cores (25) formed of cylindrical magnetic bodies which are arranged around the primary excitation portion in such a way that an axial direction of each sub-core (25) is equal to an axial direction of the main core (21). the various secondary excitation parts are configured to be capable of independently varying the position of each subnucleus (25) in the axial direction of the main core relative to the primary excitation part.