Method and apparatus for measuring the optical quality of a...

Optics: measuring and testing – Of light reflection

Reexamination Certificate

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C356S448000

Reexamination Certificate

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06985231

ABSTRACT:
A method and apparatus for inspecting the optical quality of a reflective surface providing for the reflecting of a beam of light off the reflective surface, measuring an intensity of the reflected light at a first distance from said reflective surface, measuring an intensity of the reflected light at a second distance from said reflective surface, and comparing the intensity of the light measured at the two distances to determine the distortion of the reflective surface.

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patent: 5122672 (1992-06-01), Mansour
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patent: 5210592 (1993-05-01), Bretschneider
patent: 5251010 (1993-10-01), Maltby, Jr.
patent: 5923434 (1999-07-01), Lex
patent: 5926262 (1999-07-01), Jung et al.
patent: 6100990 (2000-08-01), Ladewski
patent: 6111653 (2000-08-01), Bucknell et al.
patent: 6584217 (2003-06-01), Lawless et al.
Moire Distortiometry for the Quantitative Evaluation of Optical Quality of Glass By. A. S. Redner & G. K. Bhat , Strainoptic Technologies, Inc. Glass Processing Days, Jun. 13-16, 1999, pp. 166-168.

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