Alcatel Fibres Optiques

Alcatel Alsthom Compagnie Generale D'electricite

Alcatel Fibers Optques

Bernard Floch

Yves Lumineau

Max Matau

Michel Faure

David Sullerot

Patrick MacKenzie

Philippe Darbon

Didier Rolland

An apparatus for monitoring a moving filamentary product having a device for monitoring the centering of the filamentary product relative to the coating, and a device for monitoring the quality of the coating. The centering monitoring device includes two light sources positioned at 90.degree. to each other in a plane perpendicular to the filamentary product. The coating quality monitoring device includes an optical receiver disposed between the two light sources in the same plane, and at 45.degree. to each of them, to receive the light beams reflected by the coating.

Compact device for monitoring the coating of a moving filamentary product

The present invention relates to a method of detecting whether at least one die is centered about a thread held taught between two fixed points separated by a distance L, wherein:

Method of detecting whether at least one die is centered about a thread

This invention concerns an apparatus for checking the thickness and uniformity of a coating made of conducting material deposited on an elongated insulating body, this apparatus comprising:

Apparatus and method of checking the thickness and uniformity of a

Apparatus for detecting irregularities in the diameter of a filament has a small light source placed at the focus of an objective lens system. A horizontal slot constitutes a diaphragm for the objective lens system. A first optical system forms an image of the slot in a plane in which the filament runs past. Detectors detect the beam intercepted by the filament. An optical splitting system (P1) is interposed in the path of the beam (A), downstream of the slot (3) and upstream of the filament (5). The system is designed to form two sharp images (3', 3') of the slot (3) in a plane (4). The detectors are two oppositely-connected detectors (D1, D2) each receiving a respective beam (C, C') intercepted by the filament (5).

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Chaumont en Vexin, France

Bernard Floch