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Optics for Engineers
book

Optics for Engineers

by Charles A. DiMarzio
August 2011
Intermediate to advanced content levelIntermediate to advanced
564 pages
20h 45m
English
CRC Press
Content preview from Optics for Engineers
258 OPTICS FOR ENGINEERS
81%. We should be careful not to “mix and match,” however. It is common, and incorrect, to
use the 81% Wadsworth criterion for the valley depth and the 0.61λ/NA Rayleigh criterion for
the spacing of the points.
In 1916, Sparrow, recognizing [149] that the 81% (or 73%) valley depth is arbitrary,
suggested dening the resolution that just minimally produces a valley, so that the second
derivative of irradiance with respect to transverse distance is zero. Wider spacing results in
a valley (rst derivative positive) and narrower spacing leads to a single peak (rst derivative
negative). Sparrow’s idea is sound theory, but in practice, ...
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Publisher Resources

ISBN: 9781439807255