发明名称 |
METAL TYPE DETECTOR |
摘要 |
<p>A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the basis in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil is energized repetitively in a circuit in which the voltage across the coil, or the current that flows through the coil, can be measured. Whether the coil is in a magnetic or non-magnetic environment is determined by the magnitude of the change in coil voltage or current.</p> |
申请公布号 |
CA1160290(A) |
申请公布日期 |
1984.01.10 |
申请号 |
CA19790324036 |
申请日期 |
1979.03.23 |
申请人 |
PYATT, LAWRENCE A.;THOMPSON, ROBERT W. |
发明人 |
PYATT, LAWRENCE A.;THOMPSON, ROBERT W. |
分类号 |
E21B47/00;E21B47/09;G01D9/42;G01N27/72;G01V3/10;(IPC1-7):G01N27/72 |
主分类号 |
E21B47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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