Process for determining the location of edges and photoelectroni

Details Process for determining the location of edges and photoelectroni Process for determining the location of edges and photoelectroni

1990-01-16

1991-06-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250548, G01N 2186

Patent

active

050216740

ABSTRACT:
A process and device for determining the location of at least one edge of a moving web within a measurement zone and in which a linear array of liquid crystal light modulators is interposed between a light source and a light receiver extending transversely to the edge along a scanning zone while a controller successively activates the light modulators to scan a transparent surface zone along the measurement zone. The point at which light is last received (because of obstruction by the edge) or the first received in a pass (because of lack of obstruction by the edge) at the receiver from the source through the scanning transparent zone is used as the measure of the location of the edge.

REFERENCES:
patent: 3327125 (1967-06-01), Herchenroeder
patent: 3619626 (1971-11-01), Rudolph
patent: 4041321 (1977-08-01), Linard
patent: 4559452 (1985-12-01), Igaki et al.
patent: 4773029 (1988-09-01), Claesson et al.

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