Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1977-02-04
1979-03-13
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
340 155TA, 73574, 73667, 74 61, G01V 114, G01V 104
Patent
active
041437373
ABSTRACT:
Compact, lightweight, rotating eccentric weight seismic sources and a seismic exploration method particularly suitable for use in relatively inaccessible onshore regions. The source includes an eccentric weight rotatable about an axis and a sensor to detect the instant of peak earthward force developed by the source. A coded energy signal is transmitted into the earth and the seismic waves returned from within the earth are detected. The polarity of a signal proportional to the seismic waves is periodically sampled to produce a plurality of sign-bit samples. The sign-bit samples are automatically shift-summed in response to a code signal generated by the sensor, thereby forming a plurality of shift-summed samples which are recorded to provide a correlated seismic trace.
REFERENCES:
patent: 3185250 (1965-05-01), Glazier
patent: 3244252 (1966-04-01), Burns
patent: 3326320 (1967-06-01), Forester
patent: 3416632 (1968-12-01), Bodine
patent: 3583521 (1971-06-01), Anstey
patent: 3608359 (1971-09-01), Christmann
patent: 3697938 (1972-10-01), Taner
patent: 3878733 (1975-04-01), Tertinek
patent: 4011924 (1977-03-01), Barbier
Farrell Daniel R.
Hartman Richard C.
Moskowitz Nelson
Sandford Dean
Union Oil Company of California
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