Community Research and Development Information Service - CORDIS


A new technique has been developed to measure the shape of steel in a processing line. The principle is optical triangulation, projecting laser light fringes onto a moving strip. The non-flat areas of the strip then show up as distorted fringes on a captured image. From the image of distorted fringes, the height pattern can be calculated with respect to a predefined reference plane. A fringe-processing algorithm was developed for this calculation, and is a modification of the ''Mertz'' algorithm. ModMertz shows a faultless height result on fringe images containing high local intensity fluctuations, and these appear to be present on non-flat specular strip. Under favourable conditions a height resolution of 0.01mm is feasible, and an accuracy of better than 1 I-unit can be attained in the elongation.

Additional information

Authors: DELICAAT C L A, Hoogovens Corporate Services BV, Ijmuiden (NL)
Bibliographic Reference: EUR 18618 EN (1999) 43pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5016-1
Record Number: 199910643 / Last updated on: 1999-04-26
Original language: en
Available languages: en