The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 1989
Filed:
May. 18, 1987
Floreal Blanc, Verrieres le Buisson, FR;
Claude Bonnejean, Courcouronnes, FR;
Commissariat a l'Energie Atomique, Paris, FR;
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.