Method of measuring the dimensions of moving objects

Details Method of measuring the dimensions of moving objects Method of measuring the dimensions of moving objects

1992-04-03

1994-06-28

Evans, F. L.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

250560, 356383, 356385, G01B 1104

Patent

active

053251784

ABSTRACT:
An optical method continuously monitors the dimensions of a body having a parallelogram cross-section and supported on a moving conveyor. A first angular measurement of a first dimension of a first face of the body in a first direction is first performed, the first angular measurement being made with respect to a first reference angle at an apex of a first triangular plane having the first dimension as one side thereof. Substantially simultaneously with the step of determining the first angular measurement, a second angular measurement of a second dimension of a second face of the body in a second direction perpendicular to the first direction is determined, the second face intersecting the first face and the second angular measurement being made with respect to a second reference angle at an apex of a second triangular plane coplanar with the first triangular plane and having a second dimension as one side thereof. The first and second dimensions thus have a common point at a line of intersection of the first and second faces. The position of the common point with respect to one of the first and second directions is then estimated and an iterative process is used to determine the position of the common point. The iterative process is continued until the position of the common point is determined to within a required accuracy in both of the first and second directions.

REFERENCES:
patent: 4899061 (1990-02-01), Van Hoek et al.
patent: 4942539 (1990-07-01), McGee et al.

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