Method and device for the geometrical characterization of transp

Details Method and device for the geometrical characterization of transp Method and device for the geometrical characterization of transp

1990-08-24

1992-06-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 731, 356386, G01N 2186

Patent

active

051189542

ABSTRACT:
Method and device for the geometric characterization of transparent tubes. According to the invention, in order to characterize a transparent tube whose internal and external walls are approximately cylindrical and coaxial, the tube is placed in the air and scanned by an incident luminous beam moved parallel to it within a section plane perpendicular to the axis of the tube. Beams (F0, F1, F2, F3, F4) not deflected by the tube are detected. The detected beams, except for one which passes through the axis of the tube form two pairs. The distance between the two beams of each of these two pairs is determined, and, with the aid of these distances, the internal and external diameters of the tube at the level of the cutting plane are determined. Application for the geometric characterization of tubes for preforms for optical fibers.

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