Loss of optical input circuit

Details Loss of optical input circuit Loss of optical input circuit

1988-09-19

1990-01-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214AL, H01J 4014

Patent

active

048930024

ABSTRACT:
A loss of optical input detector is disclosed disposed to receive a signal voltage from a fiber-optic receiver indicating that the optical input has dropped below a preset threshold. The detector includes a voltage follower connected to the fiber-optic receiver which passes to the detector circuit the signal voltage. A comparator circuit receives the signal voltage and compares it to a reference voltage. When the signal voltage is greater than the reference voltage the comparator produces and applies to an alarm circuit a positive voltage signal. This positive voltage signal turns on the alarm circuit. The alarm circuit provides a visual alarm indication and a logic signal to a controller interface indicating a loss of the optical input signal.

REFERENCES:
patent: 3961183 (1976-06-01), Dubot et al.
patent: 3990799 (1976-11-01), Nanba et al.
patent: 4310755 (1982-01-01), Miller
patent: 4388732 (1983-06-01), Hansel
patent: 4435850 (1984-03-01), Bowen et al.
patent: 4596049 (1986-06-01), Rizzotti

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