| 摘要 |
<p>PURPOSE: To generate underground elastic waves by using an inexpensive device so as to accurately control the vibration of a high-pressure liquid medium by providing a vibrating source for S-wave logging which generates S waves by forming a plane of action in a stator element. CONSTITUTION: A device 10 is provided with a stator element 20 which is bound with the wall of a well 14 by means of a hydraulic binding section 24. Since the electric current flowing through a rotor coil forms torque that rotates a rotor 22 in one direction, the rotating speed of the rotor 22 quickly increases in the direction. Since a magnetic field which accelerates the rotating speed acts on the stator 20 and a rotational moment is maintained, the stator 20 receives uniform opposite torque which rotates the stator 20 in the direction shown by the arrow 50. Although the stator 20 is bound with the well 14 and not rotatable, the force is transmitted to the wall of the well 14 through the stator 20. As a result, distortional waves S are formed in the wall of the well 14 and perpendicularly propagated to a shaft 16 separated from the center of the well 14.</p> |
