Method and apparatus for the acquisition of seismic movements

Details Method and apparatus for the acquisition of seismic movements Method and apparatus for the acquisition of seismic movements

2008-07-29

2008-07-29

Lobo, Ian J (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

C367S185000

Reexamination Certificate

active

10947141

ABSTRACT:
The method and the apparatus disclosed serve to acquire seismic induced movements. A coil and a permanent magnet are contained in an enclosure and the seismic movements induce a relative movement between said coil and said magnet. The current induced into the coil is appraised as a measure of said seismic movement. The position of the coil in relation to the permanent magnet is monitored by a position sensor. A closed loop control generates a current that is fed into the coil so that the coil settles at a given neutral position relative to the permanent magnet.

REFERENCES:
patent: 4152692 (1979-05-01), McNeel
patent: 5172345 (1992-12-01), van der Poel
patent: 7099235 (2006-08-01), Kamata
patent: 2005/0201206 (2005-09-01), Luc
Yin et al., “A High-resolution wideband digital feedback system for seismometers,” J. Phys. E: Sci. Instrum. 21 (1988), 748-752.

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