Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1988-04-08
1990-03-06
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
G01B 1100
Patent
active
049060970
ABSTRACT:
The improved method and means for detecting the edges of a sample part operates on the Gaussian distribution of light intensity across a laser beam and uses analog signal and simple logical circuits to produce highly accurate, highly repeatable and rapid edge position indications. A multi-segment detector is configured with reference to the dimensions of the laser beam to provide independent outputs representative of relative position of the reflected or transmitted portion of the laser beam upon the detector as the edge of the sample part moves across the beam. An improved detector for operation with a beam having non-uniform intensity distribution thereacross includes a central segment and four perimeter segments oriented about othogonal axes that are substantially aligned with the axes of movement of the sample part across the beam. Detection of angular orientation of the edge is determined by processing the response levels of the detector segments at edge crossing of an orthogonal axis with which the segments are aligned. Angular orientation of an edge relative to the orthogonal axes is determined at the edge crossing condition by processing the response levels of diametrically-oriented detector segments.
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Evans F. L.
Lasersense, Inc.
Smith A. C.
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