G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/83 (2006.01) G01N 27/82 (2006.01)
Patent
CA 2088918
In a magnetic detecting method of the invention, a low-pass filter (107) extracts the low-frequency signal component contained in a signal (106) output by a mag- netic sensor (104) which detects a leakage flux result- ing from a magnetically defective portion of an object (101) moving in a magnetic field. The low-frequency signal component extracted is amplified and supplied to a compensating coil (111). The compensating coil (111) generates a magnetic flux, which cancels out a floating flux crossing the magnetic sensor (104). A magnetic detector of the invention comprises a low-pass filter (107) for extracting the low-frequency signal component contained in a signal (106) output by a magnetic sensor (104) which detects a leakage flux resulting from a magnetically defective portion of an object (101) moving in a magnetic field; an amplifier (110) for amplifying the low-frequency signal component extracted by the low-pass filter (107); and a compensat- ing coil (111) excited by a signal output by the amplifier (110), for generating a magnetic flux which cancels out a floating flux crossing the magnetic sensor (104).
Ando Seigo
Inaba Mamoru
Iwanaga Kenichi
Maki Hiroshi
Matsufuji Yasuhiro
Nkk Corporation
Ridout & Maybee Llp
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