Correlation Interferometer -- from Eric Weisstein's World of Physics

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Optics "> Interference "> Interferometry "> General Interferometry v

Correlation Interferometer

An interferometer that can measure angular sizes as small as 0.0005 arc seconds Eric Weisstein's World of Math from distant stars. This compares to 0.047 arc seconds Eric Weisstein's World of Math (for Betelgeuse) by the Michelson stellar interferometer.