초록 ▼

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 tw

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.

대표청구항 ▼

A fail-safe method for detecting firing of a gas exhausting gun having two closely spaced apart electrodes submerged underwater very close to the gas exhausting gun exhaust port comprising, (a) passing a current to a sea ground as a backup electrode when any one of the two electrodes becomes defecti

A fail-safe method for detecting firing of a gas exhausting gun having two closely spaced apart electrodes submerged underwater very close to the gas exhausting gun exhaust port comprising, (a) passing a current to a sea ground as a backup electrode when any one of the two electrodes becomes defective for providing a fail-safe indicator.