BARKHAUSEN NOISE TEST APPARATUS AND BARKHAUSEN NOISE TEST METHOD

摘要

PROBLEM TO BE SOLVED: To provide a Barkhausen noise test apparatus capable of detecting Barkhausen noise having a wide frequency band.;SOLUTION: The Barkhausen noise test apparatus includes: a detection head 1 having an exciting coil 2 for magnetizing an object under test 40 and a detection sensor 3 for detecting the Barkhausen noise emitted by the magnetized object under test 40; and an AC power supply 12 for supplying AC current which causes the exciting coil 2 to generate an AC magnetic field for above magnetization. A magnetic sensor employing no coil is used as the detection sensor 3 and detects surface fluxes of the object under test 40.;COPYRIGHT: (C)2011,JPO&INPIT