Method and device for the geometrical characterization of transparent tubes
First Claim
1. A device for the geometrical characterization of a tube which is transparent to at least one light and whose internal and external walls are substantially cylindrical and coaxial, wherein said device includes:
- emission means for emitting said light,means for scanning the tube with an incident light beam from said emission means by moving said incident beam parallel to itself in a section plane perpendicular to the axis of the tube;
photodetection means for detecting the beams resulting from the scanning and not deflected by the tube, said beams not deflected by the tube, except for one which passes through the axis of the tube, forming pairs; and
means for determining for two of said pairs respective distances between the two beams of each of said pairs and for determining, based upon said respective distances between the two beams of each of said pairs the internal diameter and external diameter of the tube, or the radii respectively corresponding to the diameters, at the level of said section plane.
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Accused Products
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.
33 Citations
12 Claims
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1. A device for the geometrical characterization of a tube which is transparent to at least one light and whose internal and external walls are substantially cylindrical and coaxial, wherein said device includes:
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emission means for emitting said light, means for scanning the tube with an incident light beam from said emission means by moving said incident beam parallel to itself in a section plane perpendicular to the axis of the tube; photodetection means for detecting the beams resulting from the scanning and not deflected by the tube, said beams not deflected by the tube, except for one which passes through the axis of the tube, forming pairs; and means for determining for two of said pairs respective distances between the two beams of each of said pairs and for determining, based upon said respective distances between the two beams of each of said pairs the internal diameter and external diameter of the tube, or the radii respectively corresponding to the diameters, at the level of said section plane. - View Dependent Claims (2, 3, 4, 12)
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5. A method for geometrically characterizing a tube transparent to at least one light, and whose external walls are substantially cylindrical and coaxial, comprising the steps of:
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scanning said tube with an incident beam of light, said incident beam being moved parallel to itself in a section plane perpendicular to the axis of said tube; detecting incident light beams resulting from said scanning which are not deflected by said tube, said beams not deflected by said tube forming pairs, except for an incident beam passing through the axis of said tube; determining, for two of said pairs, the distance between the two detected beams of each of said two pairs; and determining, at the level of said section plane, at least one of the internal diameter and external diameter of the tube, or at least one of the radii respectively corresponding to the internal diameter and external diameter, based upon said distances determined between said two beams of said two pairs. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification