Telescope Arrays

An interferometer consists of two separate telescopes that combine their signals almost as if they were coming from separate portions of a telescope as big as the two telescopes are apart. An array is the name used when the interferometer has more than two elements, that is, when more than 2 telescopes are used together to form the image.

The resolution of an array approaches that of a telescope of diameter equal to the largest separation between its individual elements (telescopes). However, not as many photons are collected by the array as would be by a giant single telescope of that size.

Some famous arrays are

Here is an interesting link on how radio interferometry was developed.
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