| 摘要 |
<p>A guide electro-thermal head for controllable sonde is proposed. It consists of a metal ring with segment inserted chips of Zener diodes which are always in opposite connection when supply of power to two segments and on the account of the thermal effect from the junction of the diode which is directly proportional to the voltage of the junction and the current through it, mainly the segment of the opposite connected diode is heated. In this way the thermal energy of the front of the guide pipe in the definite segment is localised. Change of the direction and the value of the voltage toward the set opposite each other segments changes as well the speed of turning of the adjacent material of thermoelastic pipe which turns itself and around the head due to the activity of the spring inserted in the wall of the guide pipe and hydraulic pressure. As a result of this the direction of the penetration of the sonde is regulated and controlled.</p> |
