Windscreen angular deviation measurement device

Details Windscreen angular deviation measurement device Windscreen angular deviation measurement device

1979-10-16

1981-02-10

Corbin, John K.

Optics: measuring and testing

Refraction testing

250237G, 356239, G01N 2141

Patent

active

042498236

ABSTRACT:
An apparatus for detecting the angular deviation from an axis imparted to a ray when passing through a transparent medium, for resolving the angular deviation into its components, and for generating electrical signals accurately representing the magnitudes of such components. A laser beam is projected along an optical axis through the medium and focussed by a displacement compensation lens. The beam is divided into channels with a beam splitter, each channel being incident upon a transmission diffraction grating. Each grating, characterized by fine parallel lines of substantially random size and spacing, generates a fan-shaped region of luminous energy. At a distance equal to the focal length of the lens, the fan-shaped regions cross detector arrays aligned parallel to the grating lines. A change in the angular deviation proportionally translates the crossing point along the detector array.

REFERENCES:
patent: 3688235 (1972-08-01), Migeotte

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