| 摘要 |
A device which picks up elastic waves, such as a geophone for example, in positions far from the natural operating position for which it is designed. The device comprises an electrodynamic pickup including a magnet (1), a moving coil (2) placed in the magnetic field, springs (4) suited to hold the coil in a well-centered static position when the axis thereof is parallel to a selected reference direction (horizontal or vertical, for example) and a current source which applies to the coil an electrical current which corrects any unbalance of the coil in relation to the static position thereof due to an inclination of the axis of the coil in relation to the reference direction. The current source may be for example a source of direct current (5) and a voltage divider (P) whose division factor depends on the angle between the axis of the pickup and a reference axis or a compensating device suited to minimize the distortion ratio of the geophone.
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