title: Propagation of cross-spectral densities from spherical sources.
abstract: We show that the cross-spectral density in the far zone of a homogeneous spherical source can be described as a low-pass filtered version of that existing across the source surface. We prove that, to an excellent approximation, the corresponding filter with respect to a (normalized) spatial frequency ξ has a functional structure of the form √(1-ξ2), for 0≤ξ≤1. The cases of spatially incoherent and Lambertian sources are treated as significant examples.
authors.affiliation: Dipartimento di Elettronica Applicata, Università degli Studi Roma Tre, Rome, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Borghi
authors.forename: F
authors.initials: F
authors.lastname: Gori
authors.forename: O
authors.initials: O
authors.lastname: Korotkova
authors.forename: M
authors.initials: M
authors.lastname: Santarsiero