Title

Image Quality Criteria For Wide-Field X-Ray Imaging Applications

Abstract

For staring, wide-field applications, such as a solar X-ray imager, the severe off-axis aberrations of the classical Wolter Type-I grazing incidence X-ray telescope design drastically limits the `resolution' near the solar limb. A specification upon on-axis fractional encircled energy is thus not an appropriate image quality criterion for such wide-angle applications. A more meaningful image quality criterion would be a field-weighted-average measure of `resolution'. Since surface scattering effects from residual optical fabrication errors are always substantial at these very short wavelengths, the field-weighted-average half-power radius is a far more appropriate measure of aerial resolution. If an ideal mosaic detector array is being used in the focal plane, the finite pixel size provides a practical limit to this system performance. Thus, the total number of aerial resolution elements enclosed by the operational field-of-view, expressed as a percentage of the number of ideal detector pixels, is a further improved image quality criterion. In this paper we describe the development of an image quality criterion for wide-field applications of grazing incidence X-ray telescopes which leads to a new class of grazing incidence designs described in a following companion paper.

Publication Date

1-1-1999

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

3779

Number of Pages

390-400

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.368231

Socpus ID

0033357241 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0033357241

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