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AssigneeSchott AG
InventorsAlexander Hecht, Andreas Veres, André Witzmann, Thomas Hofbeck
Estimating the term…
A method for measuring at least one cross-sectional dimension of a cylindrical hollow body having a wall surrounding a lumen, a longitudinal axis, an inner surface and an outer surface includes: directing a light beam along a travel path from an interferometric device towards the outer surface, such that at least intermittently at least a portion of the light beam hits the outer surface of the hollow body; receiving a portion of light reflected at the outer surface and receiving a portion of light reflected at the inner surface along the travel path at the interferometric device; obtaining at least one cross-sectional dimension of the hollow body based on an interferometric measurement of the portion of light reflected at the outer surface and/or the portion of light reflected at the inner surface; and varying an orientation of the travel path of the light beam towards the hollow body.
A method for measuring at least one cross-sectional dimension of a cylindrical hollow body, the hollow body having a wall surrounding a lumen, a longitudinal axis, an inner surface and an outer surface, the method comprising:
An apparatus for measuring at least one cross-sectional dimension of a cylindrical hollow body, the apparatus comprising:
A cylindrical hollow body having a longitudinal axis, an outer surface and an inner surface, the hollow body having a first wall thickness (WT1), an inner diameter (ID), and a second wall thickness (WT2), wherein the first wall thickness WT1, the inner diameter ID, and the second wall thickness WT2 are measurable along any straight line which stands perpendicular on the longitudinal axis, and which straight line hypothetically cuts through the hollow body, the hollow body having an outer diameter (OD) of 6 mm or less and the inner diameter is 5 mm or less, wherein an absolute difference between the first wall thickness WT1 and the second wall thickness WT2 is less than 0.01 mm and/or the inner diameter ID has a tolerance of less than 0.01 mm.
Dependencies are inferred from the claim text.