Computer Science – Numerical Analysis
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986crasm.302.1215d&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Computer Science
Numerical Analysis
Far Ultraviolet Radiation, Holography, Interference Grating, Stigmatism, Ultraviolet Astronomy, Aberration, Image Resolution, Numerical Analysis, Point Sources
Scientific paper
Numerical correction techniques are defined for use with a spherical grating to form holographic images of point sources in far-UV studies of celestial objects. The spherical grating eliminates astigmatism and coma. However, very faint sources require the application of corrective measures to offset grating aberrations. A coefficient of parabolization is presented for generating a family of quadratic solutions to correct for the grating aberrations and thus recapture the spectra of the object. Applications of the coefficient to instruments with the spectra arriving normal to the scan axis, for extended sources, and in the case of image smearing due to mechanical motions are described.
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