Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-05-18
1989-01-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, 340556, G01V 904
Patent
active
047975474
ABSTRACT:
An improved optical fiber monitoring system using a light-emitting diode which is controlled by a module 12 having an oscillator 40, a first JK trigger 42, two univibrators 44, 46 and a second JK trigger 48 with an output stage 43 being connected to one or the other of the two outputs of the first trigger. A synchronization selector 50 is also a part of the module and has four inputs connected to the four output of the two JK triggers and to an output supplying one of the four signals which are received. The photoreceiver is connected to a synchronous detector module which uses the signal supplied by the selector 50 as a synchronization signal. The system also utilizes a inhibit circuit 83 and the control system incorporates a means for detecting the possible failure of the light emitting diode 10 with the controlling means inhibiting the input 83.
REFERENCES:
patent: 3711846 (1973-01-01), Schlisser et al.
patent: 4207466 (1980-06-01), Drage et al.
patent: 4277727 (1981-07-01), LeVert
patent: 4292628 (1981-09-01), Sadler
patent: 4322721 (1982-03-01), Perren
Blanc Floreal
Bonnejean Claude
Commissariat a l''Energie Atomique
Nelms David C.
Oen William L.
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