Fail-safe methods for generating a pulse indicating the precise

Details Fail-safe methods for generating a pulse indicating the precise Fail-safe methods for generating a pulse indicating the precise

1981-01-26

1983-09-20

Farley, Richard A.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181118, 367144, G01V 138, G01V 114

Patent

active

044050330

ABSTRACT:
New methods are disclosed for detecting the instant of firing of a gas exhausting gun such as an air gun which reduce plating action on two closely spaced apart electrodes submerged underwater very close to the gas exhausting gun exhaust comprising the basic steps of passing a current through the two electrodes, and periodically reversing the current to the two electrodes responsive to a polarity reversing circuit means after (1) a predetermined period of time or (2) after each firing of the gas exhausting gun.
Likewise new methods for forming and assembling a fail-safe gas exhausting gun firing detection circuit are set forth in detail.

REFERENCES:
patent: 1212438 (1917-01-01), Bauder
patent: 3206615 (1965-09-01), La Pointe
patent: 3503861 (1970-03-01), Volpe
patent: 3840439 (1974-10-01), Marsh
patent: 4106585 (1978-08-01), Huizer
patent: 4110740 (1978-08-01), Akita et al.
patent: 4141431 (1979-02-01), Baird
patent: 4165509 (1979-08-01), Betts et al.

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