G - Physics – 01 – V
Patent
G - Physics
01
V
349/18, 349/72
G01V 1/18 (2006.01)
Patent
CA 1162636
Title. Transducer for picking up mechanical vibrations, in particular seismic waves, and a seismic measuring system including such a transducer. Abstract of the disclosure: Transducer for converting mechanical vibrations into corresponding electrical signals. Two separate coils are disposed in permanent magnetic fields produced by a magnet assembly. The coils at the one hand and the magnetic assembly at the other are mounted for movement relative to each other. The magnet assembly is structured and disposed relative to said two coils respectively so as to reduce the electromagnetic coupling between the two coils to zero, while having an electromagnetic coupling only between a respective one of said coils and said magnet assembly. In a composite seismometer comprising a transducer of the above-described type and an amplifier one of said coils is connected to the amplifier input, while the other one of said coils is included in a feedback circuit for said amplifier. When mechanical vibrations are applied to the composite seismometer the volocity difference between the inertial mass of the transducer and the housing there of is reduced to zero by the action of the electromagnetic forces caused by the current transversing said coil included in said feedback circuit.
367264
Asjes Ronald J.
Klaassen Klaas B.
Van Peppen Jacobus C.l.
de Regt Special Cable B.v.
Ridout & Maybee Llp
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