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:
Sep. 26, 1989
Filed:
Feb. 02, 1988
Luc Jeunhomme, Fontenay le Fleury, FR;
Francois X Desforges, Versailles, FR;
Photonetics, Marly le Roi, FR;
Abstract
An optical-fiber detection device which involves testing for correct operation is provided with at least one sensor having a sensing element which operates by light reflection at the end of an optical fiber and with a line for transmission of light by optical fibers. The transmission line connects the sensor to a source of periodic light pulses and to an electronic signal detection and processing unit. The sensor includes an optical fiber segment of predetermined length between the sensing element and an intermediate connection which produces a state pulse by reflection. The sensing element produces a measurement pulse which is separated from the state pulse by an elementary time interval. The electronic unit serves to detect the state of operation of the sensor by means of the presence or absence of the state pulse or reference pulse in the signals.