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Michelson interferometer

(device to measure small changes in distance or light speed)

A Michelson interferometer is a device that combines light that has traveled in two (often perpendicular) directions, aiming to detect small speed or distance changes by measuring the combined light's interference. Albert Michelson developed this type of device to measure differences in the speed of light according to direction and famously found there were none.

Much larger devices of the same general design are used to detect gravitational waves.


Referenced by:
Einstein Telescope
gravitational wave (GW)
gravitational wave spectrum
imaging Fourier transform spectroscopy (IFTS)
optical interferometer