Physics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982chphy...2.1041k&link_type=abstract
Chinese Physics, vol. 2, Oct.-Dec. 1982, p. 1041-1049. Translation.
Physics
Grazing Incidence Telescopes, Mirrors, Optical Transfer Function, Paraboloid Mirrors, X Ray Imagery, X Ray Telescopes, Fourier Transformation, Hyperbolas, Tolerances (Mechanics)
Scientific paper
An alternative to the Walter-I grazing incidence mirror system is presented, together with computational results demonstrating projected improvements in off-axial spherical aberrations and image quality. The new system consists of a pair of co-axial, nonconfocal parabolic and hyperboloid mirrors. Introduction of spherical aberrations into Wolter-I mirrors using a nonconfocus is shown to enhance the image quality in the 0-15 arcmin field angle. The modulation transfer function (MTF) is employed to examine two Wolter-I type telescopes and the new design, showing the increased accuracy using the described system. The superiority of the MTF over the line spread function and the rms of the blur circle is demonstrated for evaluating image quality. Finally, tolerance in paraboloidal mirror apertures are found to be smaller than hyperboloidal tolerances by a factor of four or five.
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