Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1981-04-23
1984-07-03
Wilbur, Maynard R.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 48, 367 58, 367178, G01V 116
Patent
active
044583419
ABSTRACT:
A geophone is disclosed which includes at least two transducers having axes which are perpendicular to each other for sensing vertical and horizontal in-line components of seismic waves. In one arrangement, the geophone includes a signal processor which includes active circuit elements responsive to the transducer output for suppressing ground roll components included in the transducer outputs. At least one of transducer output signals with ground roll signal components suppressed therefrom is connected to a remote location for recording. When more than one signal is to be sent from the geophone to the remote recording location, a mulliplexer is provided at the geophone for transmission of a plurality of geophone output signals to the remote location over a single transmission path, such as a dual-conductor transmission line. Analog and digital versions of the geophone are disclosed.
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patent: 3397754 (1968-08-01), Roden
patent: 3858168 (1974-12-01), Barr, Jr. et al.
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patent: 3988712 (1976-10-01), Ezell et al.
patent: 4189705 (1980-02-01), Pitts, Jr.
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patent: 4308598 (1981-12-01), Mahmood
patent: 4320472 (1982-03-01), Fort
Beckman Victor R.
Kaiser K. R.
Wilbur Maynard R.
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