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- W2034307948 abstract "An interferometric method for measuring the focal length of power-distributed lenses is described. The test lens is illuminated by a regular pitch interferometric pattern produced by a reflective diffraction grating interferometer. In order to measure the focal length, a CCD camera digitizes the image of the pattern magnified by the lens, and fast Fourier transformed to reconstruct the phase modulo 2π along each row. The change in spatial frequency is determined by unwrapping the phase along each row of the digitized imaged pattern. The technique is used for measuring the focal length distribution inside the progression corridor of both positive and negative progressive lenses." @default.
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- W2034307948 date "1999-07-01" @default.
- W2034307948 modified "2023-09-27" @default.
- W2034307948 title "Interferometric focal length measurement of power-distributed lenses" @default.
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- W2034307948 doi "https://doi.org/10.1016/s0143-8166(99)00050-0" @default.
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