Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1974-11-22
1976-01-06
Grimm, Siegfried H.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
250578, 356109, 356124, 356128, G01B 900, G01B 1500
Patent
active
039307328
ABSTRACT:
Device and process for testing the optical transfer function of a lens system which comprise employing as the object or target the laterally moving-fringe pattern produced by convergence of two monochromatic coherent-radiation beams of equal size and intensity and slightly different frequency. A second fringe pattern may be employed as the reference standard. Both the target and reference patterns can be varied simultaneously in spatial frequency or fringe period. The system and process can test both modulation transfer function and phase transfer function accurately at any monochromatic wavelength produced by an available coherent-radiation source to which the test lens system is transparent, e.g., ultraviolet or shorter, visible, and infrared or longer. When polarized monochromatic radiation is used, the invention can also be employed to determine the polarization characteristics of the lens. The system and process can also test chromatic aberration by successive use of different coherent monochromatic radiation wavelengths.
REFERENCES:
patent: 2878722 (1959-03-01), Hopkins et al.
patent: 3492076 (1970-01-01), Back
D. F. Horne, Optical Production Technology, Crane, Russak & Co., New York, 1972, pp. 363-382.
Atlantic Research Corporation
Grimm Siegfried H.
Ross Martha L.
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