Loss of optical input circuit

Details Loss of optical input circuit Loss of optical input circuit

H - Electricity

01

J

325/1, 340/155

H01J 40/14 (2006.01)

Patent

CA 1287904

LOSS OF OPTICAL INPUT CIRCUIT ABSTRACT OF THE INVENTION 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.

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