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- W2005441492 abstract "For two flatness requirements involved in the testing of air survey cameras special techniques have been devised.Photographic plates used for camera calibration should be flat to one or two microns. To achieve this the 14-in. plate glass supporting the emulsion is bent flat and held flat during exposure. Flatness is determined in an interferometer using infrared light.Camera register glass flatness is also checked interferometrically. Since counts of over 100 fringes are required, two monochromatic light sources are used, chosen to produce regular arrangements of black and colored fringes which permit counting by groups." @default.
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- W2005441492 date "1955-12-01" @default.
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- W2005441492 title "Control and Interferometric Measurement of Plate Flatness" @default.
- W2005441492 doi "https://doi.org/10.1364/josa.45.001009" @default.
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