Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1987-05-04
1988-09-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313538, H01J 4014
Patent
active
047711680
ABSTRACT:
The invention disclosed herein includes a low pressure, light initiated, glow discharge switch for high power application. The switch is comprised of an insulating envelope formed into a cylindrical shape having conductive plates at each end. Contained within the envelope is a cathode cup and an anode cup. Each of the cups has a plate at one end which defines two central apertures. The central apertures are positioned opposite one another a short distance apart and centrally axially aligned. A quartz window at the lower end of the cathode cup defines a visual opening to allow unfocused high energy electromagnetic radiation (UV light) to be shined upon the back side of the cathode plate. When UV light is presented to the back of the cathode plate, a photoemissive mechanism is initiated which causes an avalanche effect in the gas-filled chamber of the switch which leads to the discharge of current across the gap between the anode and cathode allowing the switch to close. A system includes the electronic switch is also disclosed which may be used to trigger a high energy flash lamp or excimer laser, as well as other high power applications. A system for controlling the flow of gas into the chamber defined by the envelope of the electronic switch is also disclosed.
REFERENCES:
patent: 3246158 (1966-04-01), Bell
patent: 3609435 (1971-09-01), Lewis
patent: 4335465 (1979-01-01), Christiansen et al.
"Pseudo-Spark Chambers for the Generation of Intense Pulsed Electron Beams," J. Christiansen.
"The Triggered Pseudo-Spark Chamber as a Fast Switch and as a High-Intensity Beam Source," D. Bloess et al., Nuclear Instruments & Methods, vol. 205, Nos. 1,2, 1/15/83, pp. 173-184.
"The Triggered Pseudo-Spark," J. Christiansen et al., Paper to be Presented at XVIth Int'l Conf. on Phenomena in Ionized Gases, Dusseldorf, 9/29-9/2/83 (Geneva, Switzerland 4/83).
Triggered Pseudospark Chamber (Bloss et al.) V.205 pp. 173-184 (1983).
Investigation of a Laser Triggered Spark Gap by: Arthur H. Guenther et al. pp. 1546-1550 (1965).
Gundersen Martin
Kirkman George
Nelms David C.
The University of Southern California
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