公开(公告)号：US3967194A

公开(公告)日：1976-06-29

申请号：US539398

申请日：1975-01-08

申请人： Ruby C. Beaver ,  Theodor Clasen ,  Wolfgang Henning ,  Emil S. Johnson

发明人： Ruby C. Beaver ,  Theodor Clasen ,  Wolfgang Henning ,  Emil S. Johnson

IPC分类号： G01N27/82 ,  G01R33/12

CPC分类号： G01N27/82

摘要： A magnetic flux leakage method and apparatus for inspecting magnetizable test objects such as pipelines are disclosed. Magnetic diodes are connected to give temperature-independent readings of flux leakage and are spaced apart according to the size of the flaws sought to be detected. Groups of diodes are overlapped to provide complete coverage of the area sought to be inspected. Certain of the largest signals received at any one time from the groups of diodes are transmitted to recording means to reduce the number of signals recorded. Diode signals are subtracted from each other to determine relative differences in detected fluxes. For inspecting pipelines, the diodes and magnets are mounted on the apparatus by mounting assemblies which pivot about three axes and the diodes and magnets are urged yieldingly toward the pipeline wall by members formed of open cell foam polyurethane. To aid in locating the flaws along the pipeline, signals from magnetic markers placed along the pipeline are detected and recorded with signals from flaws. This abstract is not to be construed in any way to define or limit the invention set forth below.

摘要翻译： 公开了用于检查诸如管道之类的可磁化测试对象的磁通泄漏方法和装置。 磁二极管被连接以提供与漏电流无关的读数，并根据所要检测的缺陷的尺寸间隔开。 二极管组是重叠的，以提供要被检查的区域的完整覆盖。 从二极管组中任意一次接收到的某些最大信号被发送到记录装置，以减少记录的信号数。 二极管信号相互减去以确定检测到的通量的相对差异。 为了检查管道，二极管和磁体通过围绕三个轴线枢转的安装组件安装在设备上，二极管和磁体通过由开孔泡沫聚氨酯形成的构件朝向管道壁有力地被推动。 为了帮助沿管道定位瑕疵，沿着管道放置的磁标记信号被检测并记录有来自缺陷的信号。 本摘要不得以任何方式解释为限定或限制下文阐述的发明。

公开(公告)号：US3949292A

公开(公告)日：1976-04-06

申请号：US539326

申请日：1975-01-08

申请人： Ruby C. Beaver ,  Theodor Clasen ,  Wolfgang Henning ,  Emil S. Johnson

发明人： Ruby C. Beaver ,  Theodor Clasen ,  Wolfgang Henning ,  Emil S. Johnson

IPC分类号： G01M3/00 ,  G01N27/82 ,  G01R33/12

CPC分类号： G01M3/005 ,  G01N27/82

摘要： A magnetic flux leakage method and apparatus for inspecting magnetizable test objects such as pipelines are disclosed. Magnetic diodes are connected to give temperature-independent readings of flux leakage and are spaced apart according to the size of the flaws sought to be detected. Groups of diodes are overlapped to provide complete coverage of the area sought to be inspected. Certain of the largest signals received at any one time from the groups of diodes are transmitted to recording means to reduce the number of signals recorded. Diode signals are subtracted from each other to determine relative differences in detected fluxes. For inspecting pipelines, the diodes and magnets are mounted on the apparatus by mounting assemblies which pivot about three axes and the diodes and magnets are urged yieldingly toward the pipeline wall by members formed of open cell foam polyurethane. To aid in locating the flaws along the pipeline, signals from magnetic markers placed along the pipeline are detected and recorded with signals from flaws. The abstract is not to be construed in any way to define or limit the invention set forth below.

摘要翻译： 公开了用于检查诸如管道之类的可磁化测试对象的磁通泄漏方法和装置。 磁二极管被连接以提供与漏电流无关的读数，并根据所要检测的缺陷的尺寸间隔开。 二极管组是重叠的，以提供要被检查的区域的完整覆盖。 从二极管组中任意一次接收到的某些最大信号被发送到记录装置，以减少记录的信号数。 二极管信号相互减去以确定检测到的通量的相对差异。 为了检查管道，二极管和磁体通过围绕三个轴线枢转的安装组件安装在设备上，二极管和磁体通过由开孔泡沫聚氨酯形成的构件朝向管道壁有力地被推动。 为了帮助沿管道定位瑕疵，沿着管道放置的磁标记信号被检测并记录有来自缺陷的信号。 摘要不得以任何方式解释为限定或限制下面阐述的发明。