An alternative set of surface error descriptors for grazing incidence optics.

Details An alternative set of surface error descriptors for grazing incidence optics. An alternative set of surface error descriptors for grazing incidence optics.

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1160..372r&link_type=abstract

Conference on X-Ray/EUV Optics for Astronomy and Microscopy, p. 372 - 380

Physics

Optics

X-Ray Telescopes: Aberrations, X-Ray Telescopes: Image Quality

Scientific paper

Orthonormal polynomials have long been used to describe optic surface errors. Previously, the product of Fourier and Legendre polynomials has been used to describe the surface errors of grazing incidence optics. The authors have applied an alternative set, Fourier-Fourier polynomials, to describe the surface errors. This set functionally differs from the Fourier-Legendre set in that each term has a finite bandwidth frequency spectrum. They discuss the advantages of this difference with respect to predictions of grazing incidence telescope performance based upon measured surface figure errors.

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