Ammunition and explosives – Igniting devices and systems – Ignition or detonation circuit
Patent
1990-02-14
1992-01-07
Jordan, Charles T.
Ammunition and explosives
Igniting devices and systems
Ignition or detonation circuit
F42C 1302
Patent
active
050780522
ABSTRACT:
Infrared proximity fuze, obtained by joining two infrared IR proximity sensors, preferably of the open field type, which have different fields of view (F.O.V.) so that the target sources presence signal is given by the simultaneous presence of an alarm signal coming from the greater field of view sensor and a time gate generated by an alarm signal coming from the lessor F.O.V. sensor. Given the carrier-to-target movement characteristics and the aperture of the two fields of view it is possible to electronically generate a time gate which rejects false targets (fires, flares, etc.) placed at considerable distances from the line of sight. The system is intrinsically protected against the effects of solar radiation combined with the nutation and precession movements of the carrier because it requires simultaneous signal presence within both fields of view.
The open field fuze signal processor checks for the simultaneous presence of a positive IR signal and of a negative rate of change of the IR signal, both characteristic of an emitter coming out of the sensor F.O.V.
REFERENCES:
patent: 3942447 (1976-03-01), Van Orsdel et al.
patent: 4098191 (1978-07-01), Bagwell et al.
patent: 4185560 (1980-01-01), Levine
patent: 4195574 (1980-04-01), MacNeille
patent: 4532867 (1985-08-01), Mitchell
Jordan Charles T.
Sistel Sistemi Elettronici S.p.A.
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