Use of spatial filtering in imaging through a randomly inhomogeneous medium

Autor:	A N Bogaturov
Rok vydání:	1994
Předmět:	Spatial filter Plane (geometry) Image quality business.industry Plane wave General Physics and Astronomy law.invention Lens (optics) Cardinal point Quality (physics) Optics law Köhler illumination business Mathematics
Zdroj:	Waves in Random Media. 4:105-115
ISSN:	1361-6676 0959-7174
DOI:	10.1088/0959-7174/4/2/001
Popis:	The possibility of improving the image quality of a coherently reflecting object, viewed through a randomly inhomogeneous medium, is investigated theoretically. Three cases of coherent illumination of the object by a plane wave are considered: illumination by unperturbed wave, illumination and viewing through different inhomogeneities of a medium, illumination and viewing through the same inhomogeneities. The spatial spectrum of the average intensity is investigated. It is shown that, when the fluctuations of the intensity in the plane of the receiving lens aperture are strong, the use of a suitable spatial filter located in the focal plane of the lens always gives an improvement of the image, but the quality of the image is better when illuminating and receiving optimal systems coincide.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5bd22194d46bc435d2221a9f605cc153 https://doi.org/10.1088/0959-7174/4/2/001 Zobrazit plný text záznamu