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Photometric Error Analysis. X: Enriched Energy (Total Illuminance) Calculations for Annular Apertures

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Abstract

Encircled energy calculations show the effects of focus errors, spherical aberration, and a central stop on image contrast. The complementary quantity (excluded energy) gives the illumination at the center of a dark spot on an incoherent background and is useful in some photometric situations. A simple formula is given for the approximate calculation of the excluded energy at large distances from the center of the diffraction pattern.

© 1970 Optical Society of America

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