发明名称 |
MAGNETIC DETECTION OF DISCONTINUITIES IN MAGNETIC MATERIALS |
摘要 |
A method and apparatus for high speed magnetic detection of surface fatigue cracks in railway rails. The magnetic material of the rail is magnetised by touch magnetisation using a permanent magnet (31), leaving a remanent magnetic field. A sensor head (30, 50) having a plurality of Hall effect sensors (32) senses stray flux generated in the vicinity of surface fatigue in the rail head by the remanent magnetic field. The sensor head (30, 50) may incorporate a proximity sensor (60) to compensate for variations in sensor height. The apparatus may be mounted on a conventional track recording vehicle (TRV) for use in routinely monitoring the surface fatigue severities in rail along a railway.
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申请公布号 |
CA2255001(A1) |
申请公布日期 |
1997.11.27 |
申请号 |
CA19972255001 |
申请日期 |
1997.05.16 |
申请人 |
TECHNOLOGICAL RESOURCES PTY. LIMITED |
发明人 |
HAY, SID;VANSELOW, ROBERT GORDON;STREET, ROBERT |
分类号 |
B61K9/10;G01N27/82;G01N27/83;G01N27/87;(IPC1-7):G01N27/83 |
主分类号 |
B61K9/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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