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1. 发明授权

US06714008B1 Gradiometric measurement methodology for determining magnetic fields of large objects 失效
标题翻译：用于确定大型物体磁场的Gradiometric测量方法
公开(公告)号：US06714008B1
公开(公告)日：2004-03-30
申请号：US10206761
申请日：2002-07-29
申请人： John J. Holmes , John F. Scarzello , Bruce R. Hood
发明人： John J. Holmes , John F. Scarzello , Bruce R. Hood
IPC分类号： G01R3300
CPC分类号： G01R33/022
摘要： Gradiometers are encompassingly disposed, relative to an object of interest, in a configuration generally describing a closed prolate spheroidal shape, and the measurements taken by the gradiometers are mathematically processed. The gradiometric measurements are defined as directional derivatives which exist in equations involving directional derivatives and prolate spheroidal multipole moments of said entity. The prolate spheroidal multipole moments are thereby calculated, and these prolate spheroidal multipole moment values are extrapolated to ascertain the magnetic fields (equivalently expressed, the magnetic signatures) associated with the object and inwardly delimited by the prolate spheroid. The practitioner can optimize such distribution numerically, orientationally and/or positionally by using the equations involving directional derivatives and prolate spheroidal multipole moments. Extraneous magnetic field effects (e.g., applied fields, earth fields) are inherently excluded, thus obviating the object's removal from an electromagnetic test facility.
摘要翻译：辐射计相对于感兴趣的物体被概括地设置在通常描述闭合的长椭球形状的构型中，并且数学地处理由梯度计进行的测量。梯度测量被定义为方程导数，其存在于涉及方向导数和所述实体的长圆球形多极矩的方程中。由此计算出长椭球形多极矩，并推断出这些长椭球多极矩值，以确定与物体相关的磁场（等价表示为磁特征），并由长椭球体内向界定。从业者可以通过使用涉及方向导数和长圆球形多极矩的方程来数字，方向和/或位置优化这种分布。固有地排除了外部磁场效应（例如，施加的场，地球场），从而避免了物体从电磁测试设备的移除。

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