| 摘要 |
A sonde assembly of the invention includes a sonde housing in the form of a nonmagnetic tube having windows therein for permitting a radio signal to be transmitted out the tube from the inside, means such as a device enclosing a front end of the tube, a sonde disposed inside the non-magnetic tube and closely fitting in a sonde cavity thereof in engagement with a front end plug. The sonde comprises a sensor and a transmitter connected to the sensor to transmit a directional signal based on sensor output, which sensor and transmitter are disposed inside a non-magnetic sonde cavity.
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