Near origin divergent brightness behavior of grazing incidence images

Details Near origin divergent brightness behavior of grazing incidence images Near origin divergent brightness behavior of grazing incidence images

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990opten..29..950g&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 29, Aug. 1990, p. 950-958.

Physics

Optics

Diffraction, Grazing Incidence, Image Processing, Optical Properties, Ultraviolet Telescopes, Wave Scattering, X Ray Telescopes

Scientific paper

A seldom-appreciated peculiarity of EUV and X-ray grazing-incidence telescope optics is the rapid enhancement of intensity near the center of the image, to a degree that is the inverse of image radius. This '1/r' behavior emerges in both pupil-diffraction and scatter effects; the FWHM for the image is accordingly misleadingly small, and constitutes an unsuitable image descriptor for grazing-incidence systems. Attention is presently given to intuitive explanations for the 1/r behavior of image intensity in grazing-incidence optics, with a view to the derivation of mathematical models which can quantitatively characterize the effect.

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