ELECTRODYNAMIC GEOPHONE OF ACCELERATIONS WITH LEAST NONLINEAR DISTORTION FACTOR Russian patent published in 2000 - IPC

FIELD: geophysical instrumentation, vibration technology. SUBSTANCE: electrodynamic geophone includes magnetic system made of permanent magnet with chosen magnetic induction B and intensity H in point corresponding to maximum of specific magnetic energy on graph of specific magnetic flux released by permanent magnet into air gaps, of two pole pieces having length L_p.p and put on permanent magnet, of magnetic circuit with two pole pieces matching by length L_p.p that of pole pieces put on permanent magnet and forming two air circular gaps together with them, each being equal to Δ, of mechanical oscillatory link composed of coil with two windings placed in air circular gaps having length L_w and wound on conducting forms having external and internal ring surfaces, of two springs linking coil to magnetic system. Distance between external and internal ring surfaces of each conducting form equals length L_p.p of pole piece and space occupied by each conducting form in each air circular gap is greater than half-space filled with coil in each air circular gap. Length L_p.p of pole piece, diameter D and length L of permanent magnet are tied up to chosen parameters of electrodynamic geophone of accelerations by specified relations. EFFECT: enlarged instant dynamic range of proposed geophone, increased resolving power of seismic prospecting. 1 dwg