ELECTRODYNAMIC GEOPHONE Russian patent published in 1997 - IPC

FIELD: vibration measuring equipment, seismic prospecting. SUBSTANCE: geophone includes magnetic system composed of case and magnet with pole pieces positioned inside case, two covers located inside case, coil with two windings placed in space between case and pole pieces and suspended from magnetic system by three elastic members, for instance, iris springs. First leads of coil windings are connected to one of first and second elastic members which other ends are first and second outputs of geophone. For provision of calibration coil is suspended from magnetic system also by means of fourth elastic member, second leads of coil windings are connected to one ends of third and fourth elastic members which outer ends are third and fourth outputs of geophone. EFFECT: enhanced operational reliability and efficiency. 2 cl, 2 dwg