Community Research and Development Information Service - CORDIS


Final report of Contract No. 7215-PP/023, 1 July 1998 to 30 June 2002.

The aim of this project is to develop and to test on-line a prototype of a new optical thickness gauge able to measure the thickness of a plate from 100 to 500 mm with a global uncertainty of +/- 0.1 mm. An optical thickness gauge was set up by Dillingen after the hot leveler, and is the basis for the development of new methods. The main point of this project is to monitor permanently on-line the gap between the reference of the two sensors. This is done in two ways:

-Development and use of an optical sensor position tracking system responsible for monitoring and compensating for the C-frame geometry variations;

-Development of a laser modulation sensor able to measure the distance between the two sensors between two plates and to measure the distance to the plate in order to measure its thickness.

Until now, the gauge has not achieved the target performance. The estimated accuracy is +1- 0.2 mm using off-line calibration every 1 to 2 hours. The optical offset compensation system doesn't compensate for all geometrical variations, only short-term thermal deformation and vibrations. The new laser modulation distance sensor is not ready to be used industrially; supplementary development must be carried out. Today, the gauge can satisfy the need above 200 mm, but its performance does not allow its use below 150 mm or when the productivity constraints need a gauge permanently on-line.

Additional information

Authors: CAMPAS J J, IRSID, Maizieres-les-Metz (FR);DIENENTHAL A, AG der Dillinger Huttenwerke, Dillingen/Saar (DE)
Bibliographic Reference: EUR 20799 EN (2003), 80pp. Euro:
Availability: EUR-OP reference: KI-NA-20799-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-5879-8
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