Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1976-10-07
1979-04-03
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181114, 181120, 181121, 340 17R, 340 155TA, G01V 114
Patent
active
041472284
ABSTRACT:
Methods and apparatus for generating and transmitting seismic signals for the purpose of seismic exploration are disclosed. The signals are force pulses shaped to have a spectrum constrained to the range of frequencies which are necessary for penetration to desired depths within the earth and for resolution of the geological reflection surfaces therein. These pulses are provided in a non-repetitive or aperiodic train, constructed to produce a transmitted energy spectrum whose mean energy extends smoothly at a substantially constant level over the spectrum frequency range, notwithstanding that the repetition frequency of the pulses may be swept over a frequency band much narrower than the spectrum range. The transmitted spectrum can exhibit an auto-correlation function having a major lobe which is predominant over any side lobes, corresponding to a desired level of resolution of the geological reflection surfaces.
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"The Pulsed Vibrator as a Seismic Source", Evison, Geophysical Prospecting, Dec. 1957, pp. 381-391.
Birmiel Howard A.
Hydroacoustics Inc.
Lukacher Martin
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