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- W2502722586 abstract "Diffraction effects may have to be taken into account in microdensitometry when dealing with relatively dark specimens even an order of magnitude larger than the wavelength of light, and become progressively more important with smaller objects. According to geometrical optical theory, when scanning across the straight edge of a uniformly absorbing, semi-infinite object the distribution error per scan line is directly proportional to the diameter of the measuring-spot. Diffraction theory predicts similar results for measuring-spots larger than about 3 times the wavelength of light, but a significant error per scan line with very small or even infinitesimal measuring-spots. Diffraction theory further indicates that point absorbance measurements can be 95 + % accurate in the centers of 6.25, 2.5, and 2.0 �.tm diameter disks with absorbances respectively up to about 1.0, 0.39, and 0.25, but that this accuracy is unattainable with any object less than 1.25 g.am in diameter. Scanning, integrating absorbance measurements are of somewhat lower accuracy than central point measurements with relatively large objects, e.g., they are only about 89% accurate with a 6 p.m diameter object of ab" @default.
- W2502722586 created "2016-08-23" @default.
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- W2502722586 date "1982-01-01" @default.
- W2502722586 modified "2023-09-27" @default.
- W2502722586 title "of Objects Small Relative to the Wavelength of Light" @default.
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