Dimension measuring apparatus

Details Dimension measuring apparatus Dimension measuring apparatus

1980-05-20

1983-04-26

Rosenberger, R. A.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356429, 250560, G01B 1110

Patent

active

043811523

ABSTRACT:
A width gauge for measuring the width of self-radiating (i.e. hot) rolled material comprises a camera containing two linear arrays of photodiodes, the camera being arranged to produce on each array an image of a respective one of the edges of the material. To avoid problems in detecting the edges caused by dark spots which may be produced on the material by slag or uneven cooling, both arrays are scanned from the less illuminated end of the array to the more illuminated end.
Other embodiments employ multi-camera arrangements to improve accuracy and/or correct errors due to changes in the position of the material, and a further embodiment employs a monochromatic light source to back-light the material and a filter in the camera matched to the light source.

REFERENCES:
patent: 3187185 (1965-06-01), Milnes
patent: 3565531 (1971-02-01), Kane et al.
patent: 3874798 (1975-04-01), Antonsson et al.
patent: 3947129 (1976-03-01), Wiklund
patent: 4067652 (1978-01-01), Bohlander

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