Patent ID: 11920914
Assignee: CORNING INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A method for measuring characteristics of a length of glass tubing, the method comprising: providing a micrometer assembly adjacent a displacement gauge assembly along a tube draw, the micrometer assembly including a plurality of non-contact optical micrometers disposed around the length of glass tubing and the displacement gauge assembly including a plurality of non-contact gauges disposed around the length of glass tubing;
measuring, using the plurality of non-contact optical micrometers, an outer diameter at each of a first plurality of positions along a circumference of the length of glass tubing;
measuring, using the plurality of non-contact gauges, a wall thickness at each of a second plurality of positions along the circumference of the length of glass tubing; and
determining an inner diameter and a concentricity of the length of glass tubing based on an index of refraction of the length of glass tubing, the measurement of the outer diameter at each of the first plurality of positions along the circumference of the length of glass tubing, and the measurement of the wall thickness at each of the second plurality of positions along the circumference of the length of glass tubing.