Electro-optical scanning system

Details Electro-optical scanning system Electro-optical scanning system

1979-06-14

1981-08-11

Corbin, John K.

Optics: measuring and testing

Of light reflection

350449, G01N 2155

Patent

active

042831474

ABSTRACT:
A defocusable electro-optical system for scanning the near-specular surface of an object to be examined with a light beam to produce a reflected-light pattern that depends on the relative reflectivity of the different components which make up the surface. The system includes a light source producing an illumination beam that is directed by a scanning mechanism through an objective which focuses the beam onto the surface to be examined. The beam reflected from the surface is directed toward a photodetector through a field stop that defines the size of the viewed area when the object surface lies in the focal plane. The viewed object surface is illuminated in a manner imaging thereon an image of the light source comparable in size to the field stop, so that when the object surface lies in the focal plane the light source image is coincident therewith. When the object surface is axially displaced from the focal plane and is out of focus, the light source image assumes an aerial position between the objective and the object surface and is relayed by the objective to function as a virtual stop whose aperture deletes that portion of the rays reflected from the object surface which otherwise cause the image of the object to blur, thereby eliminating defocus-blurring of the object image.

REFERENCES:
patent: 3909602 (1975-09-01), Micka

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