Physics – Optics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lest.rept..179b&link_type=abstract
In its LEST: Large European Solar Telescope p 179-186 (SEE N82-32209 22-89)
Physics
Optics
Apertures, Modulation Transfer Function, Point Spread Functions, Reflecting Telescopes, Solar Instruments, Cassegrain Optics, Occultation, Rayleigh Scattering, Spatial Resolution, Windows (Apertures)
Scientific paper
Spread and modulation transfer functions for: (1) the aperture of a Cassegrain telescope with main mirror radius of 125 cm and central obscuration radius of 35 cm; (2) a similar aperture, but with six circular support pads for a window, of radius 10 cm at a distance of 83.3 cm from the center (the support pads acting as additional obscurations); (3) an aperture consisting of six circular windows inscribed in a circle of radius 125 cm whose total area corresponds to the area of a circle of radius 107.09 cm, including a central obscuration circle with a radius of 35 cm; and (4) an annular aperture with radii 107.09 cm and 35 cm, corresponding to the area in case three were computed. The Rayleigh criterion for a circular aperture corresponds to a modulation of 0.1538. For an object consisting of parallel black and white stripes, this occurs for 0.05 arcsec. Resolution of 0.1 arcsec is reached with a modulation of 0.20 for apertures one to four.
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