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1. 发明公开

EP0801304A4 MAGNETIC SENSOR, AND MAGNETIC FLAW DETECTION METHOD AND APPARATUS USING THE MAGNETIC SENSOR 失效
标题翻译：磁传感器与方法及装置磁故障检测将这种磁性传感器
公开(公告)号：EP0801304A4
公开(公告)日：1999-01-27
申请号：EP96935511
申请日：1996-10-31
申请人： NIPPON KOKAN KK
发明人： MURAKAMI YOSHIHIRO , NAGAMUNE AKIO , KATO HIROHARU , YOTSUJI JUNICHI , MAEDA KOZO , IWANAGA KENICHI
IPC分类号： G01N27/82 , G01N27/90 , G01N27/83
CPC分类号： G01N27/82 , G01N27/9026 , G01N27/9033
摘要： A magnetic sensor for magnetic leakage flaw detection with high accurracy without much reducing lift-off, and a method and an apparatus for magnetic flaw detection using the magnetic sensor. The magnetic sensor (50) detects a magnetic flux generated due to a flaw in an object which is magnetized, and includes a ferromagnetic E-shaped core (51) having poles (51a, 51b, 51c) disposed in the proximity of a steel sheet (13) under inspection, and a search coil (52) for detecting the magnetic flux, wound on a center pole (51b) of the E-shaped core. External magnetic fields around this E-shaped magnetic sensor (50) pass through the magnetic poles (51a, 51c) on both sides of the E-shaped core but do not cross the center magnetic pole (51b) of the E-shaped core. Therefore, a voltage due to the external magnetic fields is not induced in the search coil (52), and only the magnetic flux resulting from the flaw is detected. Therefore, directivity to the external magnetic fields can be improved, the occurrence of the noise due to external magnetic fields can be restricted, and an S/N ratio can be improved at the time of flaw detection.
摘要翻译：在哪个漏磁探伤的磁传感器能够以高的精度进行，而不因此减少剥离，并且其磁传感器施加磁缺陷检测方法和装置。用于检测由于磁化主体的缺陷部分所产生的磁通的磁传感器50被检查具有E形具有在钢板（13）的附近布置磁极（51A，51B和51C），以芯51 被检查，并在中心磁极的搜索线圈（52）卷绕（51B），用于检测的磁通的E形铁芯的。外部磁场漂浮在E形磁传感器的圆周的磁极穿过E形铁芯51的相对侧的磁性（51a和51c中），但不穿过中间磁极51b上的的E形核心。因此，不会因外部磁场电压在测试线圈（52）引起的，所以也仅检测由缺陷引起的部分的磁通量。因此，象由于外部磁场的噪声电压的产生被抑制，S / N在缺陷检测时提高相对于该方向性外部磁场被改善。

2. 发明专利

DE69615815T2 未知
公开(公告)号：DE69615815T2
公开(公告)日：2002-06-06
申请号：DE69615815
申请日：1996-10-31
申请人： NIPPON KOKAN KK
发明人： MURAKAMI YOSHIHIRO , NAGAMUNE AKIO , KATO HIROHARU , YOTSUJI JUNICHI , MAEDA KOZO , IWANAGA KENICHI
IPC分类号： G01N27/82 , G01N27/90 , G01N27/83
摘要： A magnetic sensor in which magnetic leakage flaw detection can be performed with high accuracy without so reducing liftoff, and a magnetic flaw detection method and apparatus to which the magnetic sensor is applied. The magnetic sensor 50 for detecting magnetic flux generated due to a defect portion of a magnetized subject to be inspected has an E-shaped core 51 having magnetic poles (51a, 51b and 51c) arranged in the neighborhood of a steel plate (13) to be inspected, and a search coil (52) wound on the center magnetic pole (51b) of the E-shaped core for detecting the magnetic flux. An external magnetic field floating in the circumference of the E-shaped magnetic sensor passes through the opposite side magnetic poles (51a and 51c) of the E-shaped core 51 but does not cross the center magnetic pole (51b) of the E-shaped core. Accordingly, no voltage due to the external magnetic field is induced in the search coil (52), so that only the magnetic flux caused by the defect portion is detected. Accordingly, the directivity with respect to the external magnetic field is improved so that the generation of a noise voltage due to the external magnetic field is suppressed and S/N at the time of flaw detection is improved.

3. 发明专利

DE69615815D1 未知
公开(公告)号：DE69615815D1
公开(公告)日：2001-11-15
申请号：DE69615815
申请日：1996-10-31
申请人： NIPPON KOKAN KK
发明人： MURAKAMI YOSHIHIRO , NAGAMUNE AKIO , KATO HIROHARU , YOTSUJI JUNICHI , MAEDA KOZO , IWANAGA KENICHI
IPC分类号： G01N27/82 , G01N27/90 , G01N27/83
摘要： A magnetic sensor in which magnetic leakage flaw detection can be performed with high accuracy without so reducing liftoff, and a magnetic flaw detection method and apparatus to which the magnetic sensor is applied. The magnetic sensor 50 for detecting magnetic flux generated due to a defect portion of a magnetized subject to be inspected has an E-shaped core 51 having magnetic poles (51a, 51b and 51c) arranged in the neighborhood of a steel plate (13) to be inspected, and a search coil (52) wound on the center magnetic pole (51b) of the E-shaped core for detecting the magnetic flux. An external magnetic field floating in the circumference of the E-shaped magnetic sensor passes through the opposite side magnetic poles (51a and 51c) of the E-shaped core 51 but does not cross the center magnetic pole (51b) of the E-shaped core. Accordingly, no voltage due to the external magnetic field is induced in the search coil (52), so that only the magnetic flux caused by the defect portion is detected. Accordingly, the directivity with respect to the external magnetic field is improved so that the generation of a noise voltage due to the external magnetic field is suppressed and S/N at the time of flaw detection is improved.

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