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11. 发明授权

US5747988A Method and apparatus for flaw detection by leakage fluxes and leakage flux sensor 失效
标题翻译：漏磁检测漏磁检测仪的方法和装置
公开(公告)号：US5747988A
公开(公告)日：1998-05-05
申请号：US549674
申请日：1995-11-08
申请人： Toshiyuki Suzuma
发明人： Toshiyuki Suzuma
IPC分类号： G01N27/82 , G01N27/83
CPC分类号： G01N27/82
摘要： A leakage flux flaw detection apparatus in which an object material is magnetized and leakage fluxes derived from a flaw are detected to thereby search for a flaw of the object material in a predetermined flaw-detection direction. The apparatus has a pair of magnet poles for magnetizing the object. material in a direction different from the flaw-detection direction, another pair of magnet poles for magnetizing the object material in a direction different from the magnetization direction and flaw-detection direction of the first pair of magnet poles at a predetermined distance in the flaw-detection direction from the magnetization area of the two magnet poles, and two leakage sensors each of which is interposed between each of the two pairs of magnet poles. The leakage flux sensor which detects leakage fluxes from a flaw of the magnetized object material through two flux-sensing parts arranged in opposed relation to the object material and in predetermined spaced relation with each other along the flaw-detection direction includes two flux-sensing parts having the center distance d thereof not more than 4 mm, the length L of not less than 0.5 mm in the direction perpendicular to the flaw-detection direction, and the value d/L of not less than 1. The leakage flux sensor includes two concentrically-arranged flux-sensing parts having circular cross sections with different cross sectional areas.
摘要翻译： PCT No.PCT / JP95 / 01254 Sec。 371日期：1995年11月8日 102（e）日期1995年11月8日PCT Filed June 22，1995 PCT Pub。出版物WO96 / 00386 日本1996年1月4日检测了物体被磁化的漏磁通探伤装置，并且检测到由缺陷导出的漏磁通，从而以预定的探伤方向搜索物体的缺陷。该装置具有用于磁化物体的一对磁极。材料沿着与探伤方向不同的方向，另一对磁极，用于沿与所述第一对磁极的磁化方向不同的方向和所述第一对磁极的探伤方向以预定距离将所述物体材料磁化，从两个磁极的磁化区域的检测方向，以及两个泄漏传感器，每个泄漏传感器插入在两对磁极中的每一对之间。漏磁通传感器，其通过与物体相对设置并沿着探伤方向彼此以预定的间隔关系布置的两个磁通检测部件检测来自被磁化物体的缺陷的漏磁通量，该漏磁通传感器包括两个磁通检测部件其中心距离d不大于4mm，长度L在垂直于探伤方向的方向上不小于0.5mm，值d / L不小于1.漏磁通传感器包括两个具有不同横截面积的圆形横截面的同心布置的磁通检测部件。

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