Acoustic pulse generator

Details Acoustic pulse generator Acoustic pulse generator

1981-10-13

1984-11-27

Wilbur, Maynard R.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181117, 181401, G01V 1147

Patent

active

044846576

ABSTRACT:
Apparatus for generating an acoustic pulse in a medium wherein an impact piston is driven downwardly along a cylindrical housing by compressed gas to strike a rigid target positioned in contact with the earth. In its firing position, the tapered upper portion of the piston extends above the top of the housing within a container occupied by the compressed gas, the top of the piston being at the same time recessed within a gastight mating enclosure at the top of the container. In this position, the tapered piston surface is constantly exposed to circumferential gas pressure so as to provide a positive breakaway force. Upon release of suitable piston latch means, the piston is first urged downwardly by this breakaway force and thereafter accelerated more powerfully when the top of the piston separates from the enclosure and becomes exposed to gas flow uniformly from all directions.

REFERENCES:
patent: 1629845 (1927-05-01), Stevens
patent: 3288244 (1966-11-01), Kirby
patent: 4114723 (1978-09-01), Paitson et al.
patent: 4280248 (1981-07-01), Herubel
patent: 4284164 (1981-08-01), Airhart
patent: 4284165 (1981-08-01), Airhart et al.

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