MAGNETIC PROBE

摘要

A magnetic probe comprising a detection coil the shape of which is changeable freely depending on a test object or a required sensing accuracy precisely detects a change in the magnetic flux along the surface of the test object. A magnetic probe (1), which detects a change in the magnetic flux in the vicinity of the surface of an object (2) while generating an AC magnetic field inside the object (2) containing a metal component and/or in the space on the surface of the object (2), comprises a ferromagnetic core (3) having object proximity sections (3a), forming a looped magnetic circuit through the inside of the object (2) and/or the space on the surface of the object (2), an excitation coil (4) AC-exciting the core (3) and generating an AC magnetic field along the surface of the object inside the object (2) and/or in the space on the surface of the object (2), and a detection coil (5) the coil center line of which extends along the surface of the object (2), the coil outer face of which locally faces the surface of the object (2), and which detects a change in the magnetic flux in the vicinity of the surface of the object (2).