Process for checking the dimension of a part

Details Process for checking the dimension of a part Process for checking the dimension of a part

1978-04-14

1981-04-07

Corbin, John K.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

250224, G01B 1104, G01B 1110

Patent

active

042602602

ABSTRACT:
In a process for checking the dimension of a part, the part is moved continuously through a parallel beam of light, in a direction perpendicular to the axis of the beam, and forms a moving shadow on a pair of spaced photoelectric cells. The cells are spaced apart a distance such that there is a zone in the movement of the part in which both cells are partially shadowed and the sum of the areas of the illuminated parts of the surfaces of the cells is measured at the moment when the difference between the areas of the illuminated parts of the surfaces of the cells is zero, and compared with a reference.

REFERENCES:
patent: 3604940 (1971-01-01), Matthews
patent: 3947129 (1976-03-01), Wiklund

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