Method for spatial measurement of holes

Details Method for spatial measurement of holes Method for spatial measurement of holes

1985-07-22

1987-03-03

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356237, 356394, 358101, 358106, G01B 1100

Patent

active

046472088

ABSTRACT:
The three-dimensional position of a hole through a workpiece is determined using back lighting or front lighting (feature lighting) to determine the centroid of the hole's image in two-dimensional computer memory image space. The centroid determines a line of sight between the center of the hole's image and the actual center of the hole in real space. Next a crosshair lighting pattern (structured lighting) is projected onto the plane of the workpiece in the neighborhood of the hole. From the reflected crosshair pattern an equation representing the plane containing the hole is determined in image space. The intersection of the plane equation and the line of sight is computed and the three-dimensional, real space position of the hole is determined for comparision with an ideal position established during calibration.

REFERENCES:
patent: 3806252 (1974-04-01), Harris et al.
patent: 4555798 (1985-11-01), Broadbent, Jr. et al.
Kopydlowski, SPIE, vol. 182, Imaging Applications for Automated Industrial Inspection & Assembly, 1979, pp. 118-129.

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