Seismic pulse generation

Details Seismic pulse generation Seismic pulse generation

1990-04-23

1992-02-25

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

181118, G01V 1137

Patent

active

050918915

ABSTRACT:
A seismic pulse generator comprises a body 1 having an internal gas-pressurizable first chamber 2 adjoining a second chamber 6 for containing a fluid. A flap valve member 21 is rotatable about a pivot axis for closing a bore 24 communicating with the first chamber. A latch 22 releasably retains the flap valve member in the closed position and a gas operated piston 13 slidably moves within an associated cylinder 12. When the first chamber 2 is pressurized with gas and the flap valve member 21 is released from its closed position to uncover the bore 24, the piston 13 moves to cause communication between the chambers 2,6 and generation of a shock wave in the second chamber. The second chamber has outlet means 7 to permit a pulse of energy to be transmitted from the second chamber in response to the shock wave generated in the second chamber. The flap valve member can be arranged to be openable such that full bore opening of the bore 24, loss of gas pressure from bore 24, and the response of piston 13 to cause communication between the chambers can all be achieved very rapidly.

REFERENCES:
patent: 3724809 (1973-04-01), Reale
patent: 3741333 (1973-06-01), Muniz et al.
patent: 3800907 (1974-04-01), Chelminski
patent: 4108271 (1978-08-01), Chelminski
patent: 4182428 (1980-01-01), Savit
patent: 4633969 (1987-01-01), Palmer
patent: 4667766 (1987-05-01), Melvin
patent: 4939704 (1990-07-01), Chelminski

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