Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.354..133v&link_type=abstract
In ESA, Targets for Space-Based Interferometry p 133-135 (SEE N93-31750 12-89)
Physics
Astronomical Interferometry, Interferometers, Lunar Based Equipment, Solar Physics, Telescopes, Arrays, Design Analysis, Systems Engineering
Scientific paper
An update on a previous design study for an advanced lunar based solar observatory is presented. The original proposed configuration of 12 interferometer elements was found to be unnecessarily redundant and was revised to an 11 element configuration. The advantages of a lunar site are addressed. The new configuration and resulting UV coverage are presented. The eleven elements are arranged regularly such that the apertures are circumscribed by a 10 m diameter circle. The central spacing between elements is 2.2 m, resulting in an overlap of the autocorrelation between neighboring elements by 40 cm. This property results in a fully covered UV plane, and although the value of the array Modulation Transfer Function (MTF) may occasionally become quite small it never totally vanishes within the support area of approximately 10 m radius. Two representative cuts through the array MTF are illustrated. The MTF in the illustration has values around 0.10 throughout most of the high frequency region. Another illustration shows the corresponding cuts through the Point Spread Function (PSF) of the array. The PSF has sidelobes which are at most a factor 6.6 smaller than the central peak.
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