(device detecting properties of electromagnetic waves by detecting interference between waves)
An interferometer is a device which combines electromagnetic
waves in such manner that their interference can be detected
and used to measure properties of waves. Numerous highly-different
types of devices fit this description. In astronomy,
aperture synthesis interferometers are used to produce
very high angular resolution in measurements.
Aperture synthesis interferometry has been used for
radio telescopes since the 1950s and now enables
angular resolution detection down to microarcseconds.
It has been used for optical telescopes since the 1990s
now enabling angular resolution detection down to milliarcseconds.
Among other types of interferometry used in astronomy,
minute variations in the wavelength of spectral lines are
measured across images, e.g., the Sun, to detect Doppler shifts
due to relative radial velocity differences.
A Michelson interferometer is a specialized type used
in gravitational wave-detectors and imaging Fourier transform spectroscopies.
Atacama Large Millimeter Array (ALMA)
back end instrument
Combined Array for Research in Millimeter-wave Astronomy (CARMA)
Cosmic Anisotropy Telescope (CAT)
cosmic distance ladder
Dominion Observatory 10.03 MHz Source Catalog (DB)
European Southern Observatory Very Large Telescope (ESO VLT)
front end instrument
Giant Metrewave Radio Telescope (GMRT)
imaging Fourier transform spectroscopy (IFTS)
Large Binocular Telescope (LBT)
Badgerys Creek Interferometer 101MHz Survey (Mills)
Next Generation Very Large Array (ngVLA)
Northern Extended Millimeter Array (NOEMA)
Plateau de Bure Interferometer (PdBI)
Palomar Testbed Interferometer (PTI)
Square Kilometre Array (SKA)
Third Cambridge Catalogue of Radio Sources (3C)
Terrestrial Planet Finder (TPF)
Texas Survey of Radio Sources at 365 MHz (TXS)
Very Large Array (VLA)
Very Long Baseline Array (VLBA)
Very Small Array (VSA)