Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1983-03-18
1985-06-18
Rosenberger, R. A.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356125, G01M 1102, G01N 2155
Patent
active
045238421
ABSTRACT:
An optic surface apparatus capable of handling aspheric surfaces uses dir measurement of the blur circle of the image created by the test surface. Direct measurement of the blur circle is obtained by providing a collimated light beam which includes the test surface in its optical path to an ultimate focal point. The focal point is occupied by an apertured screen with apertures of varying diameter. A light detector is placed behind the apertured screen to measure the intensity of light as a function of aperture size. The apertured screen and detector are mounted on a three-axis translator. For apertures less than the effective diameter of the blur circle, less than 100% light is received by the detector. For apertures equal to or greater than the effective diameter of the blur circle, 100% of the light reaches the light detector. A folding mirror is used in the optical path to permit the device to be physically compact. Different wavelengths of test energy may be employed provided that appropriate adjustments are made to the corrector lens and detector choice.
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Allen Edwin M.
Fitzgerald William C.
Foust Eugene C.
Moffitt Max L.
Sievert Steven A.
Beers Robert F.
Pritchard Kenneth G.
Rosenberger R. A.
Skeer W. Thom
The United States of America as represented by the Secretary of
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