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    System and Method of Measuring Defects in Ferromagnetic Materials
    2.
    发明申请
    System and Method of Measuring Defects in Ferromagnetic Materials 有权
    铁磁材料缺陷测量系统及方法

    公开(公告)号：US20150330946A1

    公开(公告)日：2015-11-19

    申请号：US14713503

    申请日：2015-05-15

    Applicant: The Charles Stark Draper Laboratory, Inc.

    Inventor： Almir D. Davis ,  William J. Trinkle ,  Donald Gustafson ,  Philip S. Babcock, IV ,  Richard T. Berthold

    IPC: G01N27/82

    CPC classification number: G01N17/00 ,  G01N27/82 ,  G01N2021/8861 ,  G01N2021/8864

    Abstract: Defects in ferromagnetic materials are detected and characterized by analyzing the items' magnetic fields to find portions of the magnetic fields that differ in characteristic ways from residual magnetic fields generated by non-defective portions of the items. The portions of the magnetic fields that differ in the characteristic ways correspond to locations of the defects. The residual magnetic fields correspond to portions of the items distant from the defects. The defect characterization may include volume of material lost due to each defect and/or width and/or depth of each defect.

    Abstract translation: 检测铁磁材料的缺陷，并通过分析物品的磁场来寻找特征，找出特征方面与由物品的无缺陷部分产生的残余磁场不同的部分磁场。 特征方式不同的磁场部分对应于缺陷的位置。 剩余磁场对应于远离缺陷的物品的部分。 缺陷表征可以包括由于每个缺陷的每个缺陷和/或宽度和/或深度而损失的材料的体积。

    Method for Determining Defect Depth in Ferromagnetic Structures Based on Magnetic Flux Leakage Direction
    3.
    发明申请
    Method for Determining Defect Depth in Ferromagnetic Structures Based on Magnetic Flux Leakage Direction 审中-公开

    公开(公告)号：US20180038833A1

    公开(公告)日：2018-02-08

    申请号：US15671791

    申请日：2017-08-08

    Applicant: The Charles Stark Draper Laboratory, Inc.

    Inventor： Michael J. Iannucci ,  William J. Trinkle ,  Arturo D. Gossage

    IPC: G01N27/82

    Abstract: The system and method involve a permanent magnetization induction process for ferromagnetic structures, carried out to the saturation point to overwhelm the intrinsic magnetic fields in the structures. The permanent magnetization to overwhelm the intrinsic magnetization eliminates the effect of intrinsic fields for subsequent measurements. The permanent magnetization along a hollow structure yields two residual magnetic field components: axial and circumferential. The circumferential component varies as a function of depth. Thus, an analysis system can analyze defects and the depth of those defects by detecting the direction of the magnetic flux leakage around the defects. This can further be performed at a distance from the structures.

    Method for determining defect depth in ferromagnetic structures based on magnetic flux leakage direction
    5.
    发明授权
    Method for determining defect depth in ferromagnetic structures based on magnetic flux leakage direction 有权

    公开(公告)号：US10551349B2

    公开(公告)日：2020-02-04

    申请号：US15671791

    申请日：2017-08-08

    Applicant: The Charles Stark Draper Laboratory, Inc.

    Inventor： Michael J. Iannucci ,  William J. Trinkle ,  Arturo D. Gossage

    IPC: G01N27/82

    Abstract: The system and method involve a permanent magnetization induction process for ferromagnetic structures, carried out to the saturation point to overwhelm the intrinsic magnetic fields in the structures. The permanent magnetization to overwhelm the intrinsic magnetization eliminates the effect of intrinsic fields for subsequent measurements. The permanent magnetization along a hollow structure yields two residual magnetic field components: axial and circumferential. The circumferential component varies as a function of depth. Thus, an analysis system can analyze defects and the depth of those defects by detecting the direction of the magnetic flux leakage around the defects. This can further be performed at a distance from the structures.

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