Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1987-11-09
1989-04-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
H01J 4014
Patent
active
048229911
ABSTRACT:
A generator of short electromagnetic pulses utilizes a photoconductive switch having metallic strips on a substrate with a gap separation therebetween. A timing circuit provides an electrical signal to the input of the photoconductive switch and a trigger to an optical source causing a short burst of optical energy to illuminate the gap between the metallic strips, thereby causing the photoconductive substrate to provide a low impedance path between the metallic strips and coupling the electrical signal to an output terminal of the photoconductive switch for the duration of the optical pulse. A filter coupled to the output terminal of the switch, via an impedance matching section, selects a signal frequency band for further transmission.
REFERENCES:
patent: 4135099 (1979-01-01), Fiedor et al.
patent: 4218618 (1980-08-01), Mourou
patent: 4396833 (1983-08-01), Pan
patent: 4577114 (1986-03-01), Levy et al.
patent: 4691111 (1987-09-01), Bovino
patent: 4695733 (1987-09-01), Pesavento
patent: 4749850 (1988-06-01), Chemla et al.
Gilligan Lawrence H.
Halsey James D.
Riggs Robert F.
Levine Seymour
Nelms David C.
Sperry Marine Inc.
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