| 摘要 |
A damped geophone which includes a closed housing wherein a magnet supported between a pair of pole pieces is axially supported on an upstanding post connected with a bottom closure member and defines an air gap between the magnet and the surrounding housing and a coil form having a coil wound thereon is placed in the air gap. The coil form is free to move relative to the magnet and housing. It is laterally centered at a quiescent position by upper and lower spiders formed of spring material. Its axial movement is resisted by a linear spring which in the preferred embodiment has the shape of an inverted cone formed of several helixes. A damping fluid fills the housing and submerges the coil form. The damping material prevents spurious undamped response to all excitation, principally lateral excitation. The damping fluid does not materially degrade power output of the geophone.
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