Beam centering system

Details Beam centering system Beam centering system

1998-07-14

2000-04-25

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

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

250216, 356138, G01N 2186

Patent

active

060547170

ABSTRACT:
A passive target device has as its principal element an optical axcicon having an optical axis which is intended to be aligned with a reference beam. The axicon has a geometric center line coincident with its optical axis and includes at least one facet which will form a reference image when the optical axis is aligned with the reference beam, such image being symmetrical in a plane perpendicular to the optical axis. This optical axicon is mounted in a holder, such as a tubular body, having an inlet window and a output or display window, and is adapted to be supported a distance away from the source of the beam, which may vary from less than one meter up to several hundred meters. Different forms of optical elements may be utilized with the axicon, the elements employing one or more like facets arranged symmetrically about the optical axis.

REFERENCES:
patent: 5393973 (1995-02-01), Blau
patent: 5760932 (1998-06-01), Perchak

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