Method of and apparatus for measuring optical distortion

Details Method of and apparatus for measuring optical distortion Method of and apparatus for measuring optical distortion

1994-08-26

1995-11-28

Evans, F. L.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

G01N 2188

Patent

active

054712971

ABSTRACT:
A method of measuring optical distortion of measured material by disposing a background screen (2) having a predetermined regular pattern (3) in rear of a measured material (1) having light transmission properties; disposing an image pick-up device (4) capable of line-scanning in front of the measured material (1); taking a picture of the background screen through the measured material (1) by successively line-scanning the entirety of a range to be measured of the measured material (1) with the image pick-up device (4), and measuring the optical distortion of the measured material (1) on the basis of data in the picture, wherein the regular pattern (3) of the background screen is composed of triangle-wave-like unit patterns (3a), each extending continuously in a predetermined direction, which are arranged at distances of equal pitch.

REFERENCES:
patent: 4461570 (1984-07-01), Task et al.
patent: 4647197 (1987-03-01), Kitaya et al.
patent: 4776692 (1988-10-01), Kalawsky

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