Lens distortion measurement using moire fringes

Details Lens distortion measurement using moire fringes Lens distortion measurement using moire fringes

1998-01-12

1999-10-26

Font, Frank G.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356125, 356126, G01B 900

Patent

active

059737735

ABSTRACT:
A lens distortion measurement system has a first grating of a first pitch on a transparent support such as a quartz reticle. The reticle is disposed between an illumination source and the lens system whose distortion is to be measured. An image sensor is provided within the image projection field of the lens system. A second grating of a second (different) pitch is provided on another transparent support, disposed between the lens system and the image sensor. Optionally, a relay lens is disposed between the second support and the image sensor. Illumination propagates from the illumination source through the first support, through the lens system, through the second support and is incident on the image sensor. The illumination forms a Moire fringe having a pitch orders of magnitude greater than the pitches of the first and second gratings. Distortion in the lens system is measured by comparing the illumination intensity at the sensor to the expected intensity at the sensor if there was no distortion in the lens system. Therefore, small amounts of distortion of the lens system are measured.

REFERENCES:
patent: 3923400 (1975-12-01), Hardy
patent: 4794550 (1988-12-01), Greivenkamp, Jr.
patent: 4803524 (1989-02-01), Ohno et al.
patent: 4908656 (1990-03-01), Suwa et al.
patent: 5062705 (1991-11-01), Sato et al.
patent: 5500732 (1996-03-01), Ebel et al.

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