| 摘要 |
A sonde (210) is movable lengthwise in and relative to tubular structure such as a drill collar (302); slits (304,305) extend through the tubular structure; and antennae coils (315,316) on the sonde come into registration with the slits, for transmitting electromagnetic energy into the underground formation via certain slits, and for receiving such transmitted energy back through other of the slits, for processing. <IMAGE>
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