FIELD: drilling. SUBSTANCE: device has body 1 of shifter, acoustic transducer 2 consisting of two parts 3 and 4 of hollow toroid formed with circumferences of different diameters separated with partitions 5 and 6. Each part 3 and 4 of toroid has two through holes 7, 8 and 9, 10 bordering on partitions 5 and 6. One ball 11 or 12 is put into each part. Vibration generated in face propagate to borehole entrance. Balls 11 and 12 form in parts 3 and 4 four resonance absorbers of variable volume depending on positions of balls 11 and 12. With drilling in preassigned direction both balls 11 and 12 are set by partition 6. Volumes behind through holes 7 and 8 are maximal. Resonance frequencies determined in advance are not presented in spectrogram. With clockwise deflection of borehole ball 11 stays by partition 6 and ball 12 rolls to partition 5 changing volume of part 3 and absorption frequency. Frequency behind through hole 7 remains unchanged. With anticlockwise deflection of borehole ball 12 stays by partition 6 and ball 11 rolls to partition 5. Frequency behind through hole 8 remains constant and frequency behind through hole 7 changes in proportion to deflection angle. EFFECT: increased accuracy of determination of direction angle thanks to continuity of change of absorbed frequency. 1 dwg
