ELECTRODYNAMIC GEOPHONE WITH REDUCED NON-LINEAR DISTORTION FACTOR Russian patent published in 1997 - IPC

FIELD: geophysical instrument engineering. SUBSTANCE: electrodynamic geophone uses a magnetic core in the form pole shoes installed on it, each pole shoe is restricted in length by annular and end surfaces, and two windings wound on the coil form and located between the internal and external annular surfaces in air gaps formed by the magnetic core and two pole shoes. The distance between the magnetic core ends equals the distance between the end surfaces of the pole shoes, and the distance between the external annular surface of each winding and the end surface of the pole shoe makes up 1/8 of the forming two pole shoes, each of them is located concentrically and coincides in length with the pole shoes. The depth of the groove in the magnetic core makes up 2/5 to 1/2 of the air gap size. EFFECT: improved design. 2 cl, 1 dwg