Sagnac effect
（ plural ）
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A phenomenon encountered in interferometry that is elicited by rotation. The Sagnac effect manifests itself in a setup called a ring interferometer. A beam of light is split and the two beams are made to follow the same path but in opposite directions. To act as a ring the trajectory must enclose an area. On return to the point of entry the two light beams are allowed to exit the ring and undergo interference. The relative phases of the two exiting beams, and thus the position of the interference fringes, are shifted according to the angular velocity of the apparatus.
Sagnac effect
The Sagnac effect causes a measurable shift in the interference fringes of a ring interferometer when the apparatus rotates.
The Sagnac effect causes a measurable shift in the interference fringes of a ring interferometer when the apparatus rotates.
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