Communications – electrical: acoustic wave systems and devices – Signal transducers – Receivers
Patent
1998-04-08
2000-06-13
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Receivers
H04R 1100
Patent
active
06075754&
ABSTRACT:
The invention converts a conventional velocity geophone to a force-balance accelerometer. A single, spring supported geophone coil, in conjunction with a permanent magnet assembly fixed to the geophone housing, is used as both an electromagnetic velocity sensor and a force actuator. An electronic circuit is used to implement a force-balance feedback control system. The electromotive force associated with the velocity of the coil is detected and used as an input to the feedback control system. The output of the control system is applied to the same coil in such a manner as to provide negative feedback. In the presence of accelerations, the coil velocity with respect to the geophone housing is reduced essentially to zero. Thus, the force related to the external acceleration acting on the coil-mass, is balanced by the applied force. Specifically, the current applied by the control system to the same coil is proportional to the acceleration of the housing.
REFERENCES:
patent: 3508444 (1970-04-01), Sitomer et al.
patent: 3877314 (1975-04-01), Bernin
patent: 4051718 (1977-10-01), Meckl et al.
patent: 4253164 (1981-02-01), Hall, Jr.
patent: 4412317 (1983-10-01), Asjes et al.
patent: 4538203 (1985-08-01), Flanner et al.
patent: 4891983 (1990-01-01), Stewart
patent: 5119345 (1992-06-01), Woo et al.
patent: 5172345 (1992-12-01), van der Poel
patent: 5789677 (1998-08-01), McEachern
Klaassen et al., Electronic Acceleration-Sensitive Geophone* For Seismic Prospecting**, Geophysical Prospecting, vol. 31, 1983, pp. 457-480.
Usher et al. "Wide-Band Feedback Seismometers*", Physics of the Earth and Planetary Interiors, vol. 18, (1979), pp. 38-50.
Obuchi et al., "A moving Coil Dynamic accelerometer", 53rd EAED Meeting, May 1991, pp. 1-4.
Manion Stephen J.
VanZandt Thomas R.
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