公开(公告)号：US4070612A

公开(公告)日：1978-01-24

申请号：US692057

申请日：1976-06-02

申请人： James Duncan McNeill ,  Gary George Black ,  Miroslav Bosnar

发明人： James Duncan McNeill ,  Gary George Black ,  Miroslav Bosnar

IPC分类号： G01V3/10

CPC分类号： G01V3/107

摘要： Apparatus is provided which may be made portable and is calibrated to provide direct readings of terrain conductivity. Transmitter and receiver coils are separated by less than one tenth of the electrical skin depth in terrain having a maximum conductivity to be measured, at the frequency of alternating current signal applied to the transmitter coil, and the signals picked up by the receiver coil are processed to cancel received signal components in phase with the transmitted signal and amplify a received quadrature component so as to provide a direct indication of ground conductivity. The in-phase component received direct from the transmitter coil is cancelled by a preset equal and opposite component, and the in-phase component of the secondary signal received from the terrain is substantially cancelled by a form of negative feedback, in order to avoid swamping of the wanted signal. Optionally, the negative feedback is disabled and the in-phase component is displayed in order to provide an indication of the magnetic susceptibility of the terrain being surveyed.

摘要翻译： 提供了可以进行便携式并被校准以提供地形导电性的直接读数的装置。 在施加到发射机线圈的交流信号的频率处，发射器和接收器线圈被分开小于具有要测量的最大电导率的地形中的电皮肤深度的十分之一，并且处理由接收器线圈拾取的信号 以与所发送的信号同相取消接收的信号分量，并放大接收到的正交分量，以便提供地面导电性的直接指示。 从发射机线圈直接接收的同相分量被预置的相等和相反的分量抵消，并且从地形接收的次级信号的同相分量基本上被负反馈的形式消除，以便避免波动 的有用信号。 可选地，负反馈被禁用并且显示同相分量以便提供被测地形的磁化率的指示。

公开(公告)号：US5654637A

公开(公告)日：1997-08-05

申请号：US444799

申请日：1995-05-19

申请人： James Duncan McNeill

发明人： James Duncan McNeill

IPC分类号： G01V3/10 ,  G01V3/11

CPC分类号： G01V3/107

摘要： A method for surveying terrain uses transient magnetic fields transmitted from a coil in plane parallel to and above the terrain, transient voltage response from vertically spaced receiver coils coaxial with and parallel to the transmitter coil being processed to detect highly conductive objects buried in the terrain, with the ratio of the response of the coils optionally being used to estimate the depth of objects. The responses from the coils are scaled in a predetermined ratio to provide cancellation of the response from objects in a layer of terrain at a particular depth, which layer may be at the surface to remove surface responses, or beneath the surface so as to allow surface objects to be differentiated from deeper objects by providing responses of opposite polarity.

摘要翻译： 用于测量地形的方法使用从平行于和高于地形的平面中的线圈传输的瞬态磁场，来自与发射器线圈同轴并与发射器线圈同轴并且与发射器线圈并联的垂直间隔的接收器线圈的瞬态电压响应被处理以检测埋在地形中的高导电物体， 其中线圈的响应的比率可选地用于估计物体的深度。 来自线圈的响应以预定比例缩放以提供对在特定深度的地形层中的物体的响应的抵消，该层可以在表面处以去除表面响应，或者在表面下方，以允许表面 通过提供相反极性的响应，将物体与更深的物体区分开来。