Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978josa...68.1708l&link_type=abstract
Optical Society of America, Journal, vol. 68, Dec. 1978, p. 1708-1715.
Astronomy and Astrophysics
Astronomy
7
Collimators, Fresnel Diffraction, Gratings (Spectra), X Ray Diffraction, X Ray Telescopes, Design Analysis, Grids, Monochromatic Radiation, Optical Measurement, X Ray Astronomy
Scientific paper
Diffraction effects in modern designs for grid collimator telescopes (assumed to have roughly a 100-micron grid period) are apparent at wavelengths longer than 1 A and are dominant at wavelengths longer than 10 A. In collimators with many grids spaced far apart the effects of diffracation are to reduce strongly the peak transmission of the collimator at longer wavelengths and to broaden it by about the amount expected from Fraunhofer diffraction through a slit the size of the grid openings. Comparisons between two-collimator measurements and the present calculations show reasonable agreement; it is therefore concluded that the present single-collimator calculation gives a good representation of their diffraction-limited angular response.
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