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Proceedings Paper

High-precision gauging of metal rings
Author(s): Mats Carlin; Bjorn Lillekjendlie
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Paper Abstract

Raufoss AS designs and produces air brake fittings for trucks and buses on the international market. One of the critical components in the fittings is a small, circular metal ring, which is going through 100% dimension control. This article describes a low-price, high accuracy solution developed at SINTEF Instrumentation based on image metrology and a subpixel resolution algorithm. The measurement system consists of a PC-plugg-in transputer video board, a CCD camera, telecentric optics and a machine vision strobe. We describe the measurement technique in some detail, as well as the robust statistical techniques found to be essential in the real life environment.

Paper Details

Date Published: 15 November 1994
PDF: 8 pages
Proc. SPIE 2248, Optical Measurements and Sensors for the Process Industries, (15 November 1994); doi: 10.1117/12.194323
Show Author Affiliations
Mats Carlin, SINTEF Instrumentation (Norway)
Bjorn Lillekjendlie, SINTEF Instrumentation (Norway)


Published in SPIE Proceedings Vol. 2248:
Optical Measurements and Sensors for the Process Industries
Christophe Gorecki; Richard W. T. Preater, Editor(s)

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