MAGNETIC SENSOR, MAGNETIC FIELD DETECTION METHOD, AND ITS DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a magnetic sensor detecting a magnetic leakage flux due to a internal/surface flaw of a steel plate under a stable linear characteristic by determining a direction property of the magnetic flux by means of a magnetic impedance element. SOLUTION: The magnetic impedance element A outputting a variable wave varied by an external magnetic field is arranged on one face of a base board 11, and a coil C superimposing a bias magnetic field and a negative feedback magnetic field mutually and impressing them to the magnetic impedance element A is arranged on the other face of the base board 11.