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

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

Sagnac Interferometer

A ring interferometer than can be built in triangular and square configurations. Sagnac interferometers are used as an alternative to gyroscopes to measure changes with respect to an inertial reference frame in fighter planes.

Gyroscope, Interferometer