Geophone with damping coil

Details Geophone with damping coil Geophone with damping coil

1978-04-28

1979-06-26

Blum, Theodore M.

Communications: electrical

Selective

Interrogation response

G01V 116

Patent

active

041594649

ABSTRACT:
A conventional electromagnetic geophone includes a coil assembly that is spring-suspended in an air gap between concentric pole pieces of a magnet. The coil assembly is wound on the outer wall of a bobbin. The bobbin is typically made from or includes a metallic material to provide a mass for mechanical damping and a conductor for electrical eddy-current damping of the spring-suspended coil assembly. The improvement of this invention lies in mounting on the bobbin, a vernier mechanical damping mass made of a coil of insulated wire. The coil is open-ended and the mechanical damping force is adjustable in accordance with the number of turns in the coil.

REFERENCES:
patent: 3582875 (1971-06-01), Van Wambeck et al.
patent: 3913063 (1975-10-01), Sears

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