High resolution geophone

Details High resolution geophone High resolution geophone

1994-07-20

1995-11-21

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

H04R 902

Patent

active

054694086

ABSTRACT:
A geophone is disclosed that has a cylindrical housing closed at one end by a bottom and the other end by a top. A magnet assembly of a rare earth magnet with pole pieces at each end of the magnet is centrally mounted in the housing providing an annular space between the magnet assembly and the housing. A coil form is located in the annular space. Springs support the coil form for axial movement relative to the magnet assembly along the longitudinal axis of the housing. The rare earth magnet produces a magnetic field sufficiently strong that the pole pieces can be made longer than the coils on the coil form thereby provided a uniform magnetic field in which the coils move thereby reducing the amount of harmonic distortion produced by the geophone.

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