Diffraction Effects Of Secondary Mirror Spiders Upon Telescope Image Quality

James E. Harvey; Christ Ftaclas

doi:10.1117/12.948005

27 January 1989 Diffraction Effects Of Secondary Mirror Spiders Upon Telescope Image Quality

James E. Harvey, Christ Ftaclas

Proceedings Volume 0965, Current Developments in Optical Engineering III; (1989) https://doi.org/10.1117/12.948005
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

Diffraction effects of secondary mirror spiders upon telescope image quality can be important in certain imaging applications. However, rigorous analytical calculations are often unwieldy and virtually all commercially available optical design and analysis codes that have a diffraction analysis capability are based upon numerical Fourier transform algorithms which lack adequate sampling density to model very narrow spiders. A simple empirical equation is developed that allows accurate engineering calculations of fractional encircled energy to be made for arbitrary spider configurations. Characteristic design and evaluation curves are provided for use with this equation for a variety of obscuration ratios and spider widths. The results of this empirical equation are compared to those of rigorous calculations to determine its range of validity. Finally, parametric encircled energy curves are presented that provide insight into the diffraction effects of secondary mirror spiders.

Citation Download Citation

James E. Harvey and Christ Ftaclas "Diffraction Effects Of Secondary Mirror Spiders Upon Telescope Image Quality", Proc. SPIE 0965, Current Developments in Optical Engineering III, (27 January 1989); https://doi.org/10.1117/12.948005

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