Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1975-10-10
1977-08-16
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181113, 181106, 340 155SW, G01V 114
Patent
active
040420639
ABSTRACT:
A shear wave vibrator is constructed having a frame with first and second oppositely facing plenum chambers secured to the frame and each having an outer periphery. A skirt is attached to each of the outer peripheries. A fan is attached to the frame with conduits supplying a volume of air under pressure to each of the plenum chambers. A modulation apparatus is mounted in each of the first and second plenum chambers to cause a variation in air pressure in each of the plenum chambers in accordance with a predetermined signal in a manner to cause the air pressure in one chamber to decrease at the same instant the air pressure in the oppositely facing chamber is increasing and vice versa. The entire apparatus is mounted between opposite walls of a trench.
REFERENCES:
patent: 2760591 (1956-08-01), White
patent: 3159232 (1964-12-01), Fair
patent: 3205971 (1965-09-01), Clynch
patent: 3221833 (1965-12-01), Malmberg
patent: 3346066 (1967-10-01), Miller, Jr.
patent: 3716111 (1973-02-01), Lavergne
Birmiel Howard A.
Continental Oil Company
Miller William J.
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