Detection of electromagnetic radiation

Details Detection of electromagnetic radiation Detection of electromagnetic radiation

1988-01-07

1989-12-26

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250372, 250375, H01J 4702

Patent

active

048899941

ABSTRACT:
A system for detecting ultra-violet radiation has a cold cathode discharge tube which produces a pulse each time it avalanches. A logic arrangement steers these pulses successively to separate timers in that order. In response to each pulse, each timer sends its own output line HIGH for a preset period, the same for all the timers. An AND gate receives all the timer outputs and produces an alarm signal when all these are HIGH at the same time.

REFERENCES:
patent: 3342995 (1967-09-01), Axmark
patent: 4016425 (1977-04-01), Farquhar et al.
patent: 4162425 (1979-07-01), Larsen et al.
patent: 4414542 (1983-11-01), Farquhar et al.
patent: 4736105 (1988-04-01), Fonnesbeck
patent: 4765413 (1988-08-01), Spector et al.

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