Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1982-08-23
1985-02-12
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
376376, G01B 1114
Patent
active
044987765
ABSTRACT:
To measure the flushness and the gap width between adjacent spaced panels, a pair of light sources project beams of light onto the respective panels adjacent the gap at oblique angles to the panels to provide on each panel an illuminated region extending from the gap to a sharply defined boundary so that for a given position of the gap relative to the light beams outer margin the width of the illuminated portion of each panel transverse of the gap is a function of the position of each panel in relation to the light source and the relative positions of the outer margins depend upon the flushness of the panels. In the preferred form an electronic camera comprising a linear photodiode array receives an image of the illuminated pattern, the optics being such as to provide a sharp image within a predetermined range of flushness. The apparatus, in the preferred form, senses the position of the central gap-produced dark portion of the image and activates the measurement when the same is centered at an image position substantially on the central plane of the unit and is electronically controlled so that when the image is centered the camera measures the widths of the illuminated portion on each pattern. The outer edges of the image and the edges of its central dark portion, at the time of such activation respond to the flushness of the panels and the width of the gap. In the preferred form, computer means responsive to the photodiode array provides a readout of gap width and flushness. The light source and camera are mounted together and preferably carried by a manipulator or robot for easy positioning at desired portions of the panels which may be stationary or moving on a conveyor.
REFERENCES:
patent: 3187185 (1965-06-01), Milnes
patent: 3773422 (1973-11-01), Stavis et al.
patent: 3802774 (1974-04-01), Eschler et al.
patent: 3976382 (1976-08-01), Westby
patent: 4105925 (1978-08-01), Rossol et al.
patent: 4198164 (1980-04-01), Cantor
General Motors Corporation
Hill Warren D.
Rosenberger R. A.
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