Detection of electromagnetic radiation
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United States of America Patent
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Dec 26, 1989
Grant Date -
N/A
app pub date -
Jan 7, 1988
filing date -
Jan 7, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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