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Proceedings Paper

Positional and orientational referencing of multiple light sectioning systems for precision profile measurement
Author(s): Mark Tratnig; Helmut Hlobil; Johann Reisinger; Paul L. O'Leary
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Paper Abstract

Precision rolled strips are often intermediate products in the manufacturing of blades. In such cases the shape and size of these strips are essential to the functionality and quality of the blade and cutting workpiece. Although precision strips are normally produced in heavily automated rolling mills, their size and shape are still inspected manually with profile gauges and microscopes. In this paper we present a measurement setup with multiple light-sectioning systems, which is suitable for the inspection of all sides of a profiled strip. It consists of three measurement heads, which are used to inspect the upper side, the lower side and the back of the blade. The heads are calibrated individually; the focus of the work here is to determine the relative position and orientation of the heads with respect to each other. The first approach has been developed to reference two or more measurement heads. The calculation of the required transformations is based on the rotation of a suitable target. Due to the small depth of field, the location of the rotation axis must be pre-adjusted very precisely. To improve the accuracy and to simplify the process, a second referencing method was developed. The required target was manufactured by means of a 5-axis high speed milling machine and features a thickness tolerance of less than 1 micron. Both the referencing method and target are presented. Additionally, we demonstrate the all-side inspection of a blade. It will be shown that the approaches allow a robust and flexible referencing of multiple measurement heads to each other.

Paper Details

Date Published: 24 February 2005
PDF: 12 pages
Proc. SPIE 5679, Machine Vision Applications in Industrial Inspection XIII, (24 February 2005); doi: 10.1117/12.586501
Show Author Affiliations
Mark Tratnig, Univ. of Leoben (Austria)
Helmut Hlobil, Voestalpine Mechatronics GmbH (Austria)
Johann Reisinger, Voestalpine Mechatronics GmbH (Austria)
Paul L. O'Leary, Univ. of Leoben (Austria)

Published in SPIE Proceedings Vol. 5679:
Machine Vision Applications in Industrial Inspection XIII
Jeffery R. Price; Fabrice Meriaudeau, Editor(s)

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