Apparatus for determining the position of a surface

Details Apparatus for determining the position of a surface Apparatus for determining the position of a surface

1975-04-30

1976-11-30

Corbin, John K.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

250237?R, G01B 1100

Patent

active

039945898

ABSTRACT:
This invention is directed to an electro-optical apparatus for determining the position of an opaque surface without contact with the surface. It includes a light beam system which projects a well defined beam having a rectangular cross-section, obliquely onto the surface such that any movement of the surface in the perpendicular direction will result in a displacement of the illuminated area on the surface, and a detector which converts this displacement into a proportional light intensity. The detector has a field stop with an aperture of specific shape onto which the illuminated area is imaged such that only a portion of the image will pass through the aperture depending on the displacement of the illuminated area. A photosensitive device is used to measure the light intensity passing through the aperture. Embodiments of apparatus for normalizing the output for greater precision are described as well as a system for measuring the thickness of an object by determining the position of two opposite surfaces of the object.

REFERENCES:
patent: 3016464 (1962-01-01), Bailey
patent: 3187185 (1965-06-01), Milnes
patent: 3565531 (1971-02-01), Kane et al.
patent: 3667846 (1972-06-01), Nater et al.
patent: 3671726 (1972-06-01), Kerr
patent: 3749500 (1973-07-01), Carlson et al.

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