System for measuring angular deviation in a transparency

Details System for measuring angular deviation in a transparency System for measuring angular deviation in a transparency

1981-03-11

1983-03-22

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

356371, G01N 2188

Patent

active

043773419

ABSTRACT:
An improved system for measuring absolute angular deviation through transparencies, such as aircraft windscreens, uses an incoherent light source and a target configuration in the form of an opaque slide with a transparent "L"-shaped pattern. The positions of images of the legs of the "L" passed through the transparency are detected by CCD arrays for measurement of the azimuth and elevation components of angular deviation for each tested point on the transparency, uncontaminated by lateral displacement errors.

REFERENCES:
patent: 3578869 (1971-05-01), Irland et al.
patent: 3688235 (1972-08-01), Migeotte
patent: 4249823 (1981-02-01), Task
patent: 4255055 (1981-03-01), Schave
patent: 4310242 (1982-01-01), Genco et al.

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