Method and apparatus for detecting the presence and location of

Details Method and apparatus for detecting the presence and location of Method and apparatus for detecting the presence and location of

1995-03-07

1996-10-15

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250221, 25055929, 359220, G01N 2100, G01N 2186

Patent

active

055656862

ABSTRACT:
An optical system and method for detecting the presence and location of multiple objects in a field. The optical system has at least one light source to generate a beam, which beam is scanned by at least one first reflecting surface to generate at least three sets of beams. A first and second set of beams are overlapped across the field by at least one second reflecting surface and a third set overlaps the field without the second reflecting surface. The beam intensity is measured by at least one detection means.

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