Dual mode seismic source vibrator

Details Dual mode seismic source vibrator Dual mode seismic source vibrator

1981-08-03

1984-05-29

Wilbur, Maynard R.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

92 131, 181119, G01V 1133

Patent

active

044509286

ABSTRACT:
A dual mode vibrator (DMV), in its hydraulic cylinder, automatically provides a shorter stroke for higher frequencies and a longer stroke for lower frequencies. The cylinder contains a pair of sleeves, each sleeve having one diameter portion sufficient to slideably engage the piston and having a smaller diameter portion to slideably engage the piston rod. The sleeves themselves are moveable within the cylinder, such movement being effected by the application of high pressure on one end or the other. When the sleeves are moved together, the stroke is effectively shortened. When the sleeves are moved apart, the stroke is effectively lengthened.

REFERENCES:
patent: 356538 (1887-01-01), Hubner
patent: 2478790 (1949-08-01), Stephens
patent: 2596471 (1952-05-01), Densmore et al.
patent: 3529428 (1970-09-01), Batten
patent: 3926409 (1975-12-01), Abney et al.
patent: 4046623 (1977-09-01), Schmid
patent: 4072087 (1978-02-01), Mueller
patent: 4106586 (1978-08-01), Stafford
patent: 4147228 (1979-04-01), Bouyoucos
patent: 4253538 (1981-03-01), Weber et al.

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