Image:Ast opt int mask.gif

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A single large telescope with an aperture mask over it (labelled Mask), only allowing light through two small holes. The optical paths to detectors 1, 2, 3 and 4 are the same as in the left-hand figure, so this setup will give identical results. By moving the holes in the aperture mask and taking repeated measurements, images can be created using aperture synthesis which would have the same quality as would have been given by the right-hand telescope without the aperture mask. In an analogous way, the same image quality can be achieved by moving the small telescopes around in the left-hand figure — this is the basis of aperture synthesis, using widely separated small telescopes to simulate a giant telescope.]] This is optically identical to the two-telescope interferometer shown on the right.

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	Date/Time	Dimensions	User	Comment
current	10:23, 23 February 2005	306×637 (10 KB)	Rnt20 (Talk \| contribs)	(A telescope with a mask covering it allowing light through two holes is optically identical to the two-telescope interferometer shown in thumb. {{PD-self}})