| 发明名称 |
DEVICE FOR AUTOMATICALLY COMPENSATING THE MAGNETISM OF DRILL RODS |
| 摘要 |
<p>11 Device for automatically compensating the magnetism of drill rods. Each end of the rods surrounding the positioning sensor is provided with a coil, through which passes a current, whose intensity is automatically regulated as a function of the sensor readings in order to make the gradient of the magnetic field due to the rods and to the field itself zero within the sensor area. (Fig. 4)</p> |
| 申请公布号 |
CA1215115(A) |
申请公布日期 |
1986.12.09 |
| 申请号 |
CA19840449213 |
申请日期 |
1984.03.09 |
| 申请人 |
COMMISSARIAT A L'ENERGIE ATOMIQUE |
发明人 |
CHIRON, GUY;VIDAL, JEAN-CHARLES |
| 分类号 |
E21B7/06;E21B7/04;E21B17/16;E21B47/02;E21B47/022;G01R33/025;(IPC1-7):G01V3/26;G01V3/28 |
主分类号 |
E21B7/06 |
| 代理机构 |
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代理人 |
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