Method and apparatus for dimensional measurement of an object

Details Method and apparatus for dimensional measurement of an object Method and apparatus for dimensional measurement of an object

1989-02-28

1990-06-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356386, 358107, G01N 2186, G01B 1110, H04N 718

Patent

active

049316583

ABSTRACT:
The apparatus disclosed includes at least two optical measuring devices for forming independent images of the object in their respective focal planes. From these images a specific dimension of the object, for example its diameter where a circular object is concerned, may be obtained. To correct for inaccuracies due to product movement, the dimension of the product obtained from one of the measuring devices is compensated by a positional measurement obtained from the other camera and vice versa. By this means accurate determination of the size of a product, for example a cable moving in an extrusion run, is possible without contact being necessary within the product.

REFERENCES:
patent: 3761182 (1973-09-01), Kubisiak et al.
patent: 3897156 (1975-07-01), Chasson
patent: 4152767 (1979-05-01), Laliotis
patent: 4461575 (1984-07-01), Miller, Jr. et al.
patent: 4499383 (1985-02-01), Loose
patent: 4772128 (1988-09-01), Vinarub et al.

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