Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge – Structurally combined with building or vehicle
Patent
1988-12-09
1990-12-25
Pellinen, A. D.
Electricity: electrical systems and devices
Discharging or preventing accumulation of electric charge
Structurally combined with building or vehicle
361220, 361225, H05F 306
Patent
active
049807951
ABSTRACT:
A method and apparatus for discharging electric charge accumulated on an object tht expels an electrically conductive gas flow, such as a jet engine, a rocket, or a helicopter or aircraft with an internal combustion engine. The system has an electrical shield surrounding a portion of the gas flow, and an electrode for imposing an electric potential in the shielded gas flow. A servo controller measures the accumulated charge at a point on the object and creates a control signal responsive to the rate at which charge is accumulating. The servo controller imposes an electric potential on the electrode, and hence the gas flow, of an amount and polarity determined by the rate and polarity of charge accumulation. In so doing, the electrode accelerates charges of opposite polarity in the conductive gas away from the object, and deaccelerates like charges towards the object, where they tend to cancel accumulated charges, thus discharging the object.
REFERENCES:
patent: 3035208 (1962-05-01), Clark
patent: 3600632 (1971-08-01), Bright et al.
patent: 3733038 (1973-05-01), Ikrath et al.
patent: 3874616 (1975-04-01), Buser et al.
patent: 4228479 (1980-10-01), Larigaldie et al.
M. Brook et al., A Helicoper Electric Charge Control Study: A Report of W Performed under ONR Contract N00014-84-K-0623 during the Contract Period from Aug. 1, 1984 through Jul. 31, 1986 (Jul. 3, 1986, cover date).
Brook Marx
Moore Charles B.
Richards Clyde
Gaffin Jeffrey A.
McDonnell Thomas E.
Miles Edward F.
Pellinen A. D.
The United States of America as represented by the Secretary of
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