Surface sensor

Details Surface sensor Surface sensor

G - Physics

01

B

340/123.4

G01B 11/30 (2006.01)

Patent

CA 1078489

SURFACE SENSOR ABSTRACT FOR THE DISCLOSURE A device for continuously indicating the topo- graphical profile of the surface of a travelling paper web is provided by using a light source directed perpendicul- arly to the surface to illuminate areas on the surface no greater than about 1 mm in diameter. Non-specular light reflected from the surface is detected by a pair of detectors arranged around the illuminated-area thereby to generate a pair of signals. These signals are electrically processed by subtracting one from the other to obtain an indication of the slopes of the surface in the instantaneously illuminated areas thereby to obtain continuous indication of the topographical profile of the surface while substantially reducing the effects of local differences in reflectivity of the surface.

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