Acoustic impulse generator

Details Acoustic impulse generator Acoustic impulse generator

1979-06-25

1981-08-25

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

367144, G01V 1137, G01V 138

Patent

active

042854156

ABSTRACT:
Apparatus for controlling a release of pressurized fluid, to generate an acoustic or shock wave impulse for use in underwater reflection seismic surveys. Compressed air is supplied to the acoustic impulse generator and is used both to provide the compressed air acoustic impulse and to retain two piston members in sealing engagement with each other to maintain the compressed air within the apparatus. The two internal pistons are hollow, open-ended cylindrical members, and are adapted to slide axially within a cylindrical chamber and abutt one another to preclude escape of compressed air. To fine the acoustic impulse generator, compressed air pressure holding the first piston member in position over a series of exhaust ports is suddenly reduced, causing that piston to shift within its chamber, exposing the ports to atmosphere and thereby emitting an acoustic impulse of compressed air. Immediately thereafter, residual air pressure within the device causes the second piston to shift in the same direction following the first piston to again close the exhaust ports and preclude further escape of compressed gas, thus defining an acoustic impulse of finite duration.

REFERENCES:
patent: 2083695 (1937-06-01), Dull
patent: 2083705 (1937-06-01), Harris
patent: 3276534 (1966-10-01), Ewing et al.
patent: 3379273 (1968-04-01), Chelminski
patent: 3638752 (1972-02-01), Wakefield
patent: 3979140 (1976-09-01), Silverman et al.
patent: 4049078 (1977-09-01), Paitson et al.
patent: 4114723 (1978-09-01), Paitson et al.
patent: 4180139 (1979-12-01), Walker

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