Method and apparatus for determining shapes of countersunk holes

Details Method and apparatus for determining shapes of countersunk holes Method and apparatus for determining shapes of countersunk holes

1998-04-09

2000-11-28

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

G01B 1124

Patent

active

061542792

ABSTRACT:
The dimensions of a countersunk hole, or of a fastener head, are determined accurately and rapidly by a nondestructive measurement system. At least one laser projects spots of light onto the surface being analyzed. From knowledge of the projection angle, and of the lateral displacement of the spots of light caused by variations in the depth of the surface, one can calculate an actual depth of each point on the surface. A set of parameters defining a mathematical model of the hole or fastener head are fitted to a set of measured coordinates of points on the surface being analyzed, using conventional numerical techniques. The optimized parameters define the dimensions of the countersunk hole or fastener head. The present invention operates independently of the coordinate system used to perform the measurements, so the invention eliminates errors caused by misalignment of optical components. The invention can also provide automatic warnings when the dimensions of a particular countersunk hole or fastener heads exceed predetermined tolerances.

REFERENCES:
patent: 4741621 (1988-05-01), Taft et al.
patent: 4894551 (1990-01-01), Kishimoto et al.
patent: 4948258 (1990-08-01), Caimi
patent: 5196900 (1993-03-01), Pettersen

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