Device and method for evaluating optical distortion of...

Details Device and method for evaluating optical distortion of... Device and method for evaluating optical distortion of...

2003-12-15

2009-02-24

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

Reexamination Certificate

active

07495760

ABSTRACT:
To provide estimating apparatus and method of the optical distortion of light transmitted through a transparent plate-shaped body.Upon picking-up a grid pattern via a glass plate by an image pickup device, 4n±α CCD pixels correspond to n grids (pair of a bright portion and a dark portion), thereby generating α moire fringes. Sine waves with a phase A and sine waves with a phase B deviated from the phase A by 90° are generated based on gray data of the picked-up image in this state. A phase angle at each pixel on the Lissajous figure is calculated based on the sine waves with the phases A and B, and the refractive power is calculated based on a phase angular speed, serving as the difference between the phase angles of the pixels.

REFERENCES:
patent: 5216481 (1993-06-01), Minato
patent: 6509967 (2003-01-01), Pingel et al.
patent: 2-73140 (1990-03-01), None
patent: 11-148813 (1999-06-01), None
patent: 2002-148195 (2002-05-01), None
WO98/17993, pub: Apr. 30, 1998, Pingel et al.

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