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TitleRadiometric properties of two-aperture fields
Publication TypeJournal Article
Year of Publication1996
AuthorsTrotter, A.B.
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Pagination1072 - 1077
Date Published1996
ISSN07403232 (ISSN)
AbstractA method is described for determining the photometric field given by an extended source when the source is constrained to radiate through two spaced apertures. It is based on a generalization of the photometric inverse-square law in which flux density is considered to be the scalar product of a vector and the unit normal at a given surface element. The result includes an in-plane field that makes the solution independent of element orientation. Computer-generated field maps are used to illustrate the properties of both fields for an arbitrary system. The normal component exhibits two distinct axial inverse-square laws, and the method correctly predicts that total normal flux is conserved on the surfaces considered. Analogous procedures on the in-plane field give new results that complement those of the present scalar theory. Two-aperture effects are commonly found in optical systems. They affect photometric measurements made on or with such systems. © 1996 Optical Society of America.

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