Monitoring the planarity of metal sheet

Details Monitoring the planarity of metal sheet Monitoring the planarity of metal sheet

1983-12-20

1985-09-17

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 1, G01B 1124

Patent

active

045417237

ABSTRACT:
Optical beams from lasers are directed towards the middle and edges of a hot rolled steel sheet by fixed mirrors and rotatable mirrors which allow for different sheet widths. The points of incidence of the beams are observed by photodiode cameras whose receiving axes are orientated by fixed mirrors and rotatable mirrors so that the points remain in the respective fields of observation of the cameras. The levels of the points are obtained by triangulation and are used in the calculation of the planarity of the sheet.

REFERENCES:
patent: 3187185 (1965-06-01), Milnes
patent: 3565531 (1971-02-01), Kane
patent: 3573849 (1971-04-01), Herriot
patent: 3610754 (1971-10-01), Pirlet
patent: 3671726 (1972-06-01), Kerr
patent: 4198164 (1980-04-01), Cantor
Pirlet et al., "CRM Develops Laser-Based Hot Strip Flatness Gauge", Iron and Steel International, vol. 51, No. 4, (Aug. 1978), pp. 215-216, 219-221.

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