G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/90 (2006.01)
Patent
CA 2154905
A flaw sensor for metal pipes comprising an exciting coil for generating a remote field eddy current in a metal pipe when an exciting signal is applied; a first receiving coil group comprising a plurality of first receiving coils which are separated from the exciting coil by a predetermined distance in the longitudinal direction of the pipe, whose axes are perpendicular to the longitudinal direction of the metal pipe, and which are disposed at predetermined intervals in the circumferential direction of the metal pipe to receive a reception signal caused by the remote field eddy current; a second receiving coil group comprising a plurality of second receiving coils which are separated from the first receiving coil group by a predetermined distance, whose axes are perpendicular to a longitudinal direction of the metal pipe and which are disposed at positions staggered from the first receiving coils to receive the reception signal caused by the remote field eddy current; and a third receiving coil disposed so that its axis is coaxial to the longitudinal direction of the metal pipe. When the metal pipe is a sound metal pipe having no defective portions, the magnetic field caused by the remote field eddy current is reliably detected by the third receiving coil because the magnetic field takes a magnetic path parallel to the axis of the metal pipe and the specific phase difference of the sound metal pipe is detected. When there is a defective portion in the thickness of the metal pipe, the magnetic field is formed also in the direction perpendicular to the axis of the metal pipe, so that it is reliably detected by the first and second receiving coils.
Akita Masanori
Chiba Yoshikazu
Hosohara Yasuharu
Kawabe Toshihide
Kinoshita Akira
Cxr Corporation
Kirby Eades Gale Baker
Osaka Gas Co. Ltd.
Toho Gas Co. Ltd.
Tokyo Gas Co. Ltd.
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