Geospace Technologies Corporation
OMNI-DIRECTIONAL GEOPHONE WITH 10 HERTZ NATURAL FREQUENCY

Abstract:

A geophone includes a magnet, an electrical coil assembly, and a tubular case. The electrical coil assembly is disposed about the magnet, and is movable in an axial direction with respect to the magnet. The electrical coil assembly includes a coil, a first spring disposed at a first end of the electrical coil assembly, and a second spring disposed at a second end of the electrical coil assembly. The first spring and the second spring are configured to produce a natural frequency of 9 Hertz to 12.5 Hertz in oscillation of the coil about the magnet. The magnet and the coil assembly are coaxially disposed within the tubular case. The tubular case is no more than 1.7 inches in length. The electrical coil assembly is configured to move in an axial direction with respect to the magnet in any orientation of the tubular case.