Sagnac effect


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Sagnac effect

[′sän·yäk i‚fekt]
(optics)
The shift in interference fringes from two coherent light beams traveling in opposite directions around a ring when the ring is rotated about an axis perpendicular to the ring.
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These MEMS gyroscopes are limited in their sensitivity, so optical gyroscopes have been developed to perform the same function but with no moving parts and a greater degree of accuracy using a phenomenon called the Sagnac effect.
A subsequent series of experiments were carried out with careful studies of systematic effects by measuring the bending effect using X-rays and considering the Sagnac effect [2] due to the rotation of the Earth [3, 4].
Resonant integrated optical gyroscope (RIOG) is a high performance rotation sensor based on the Sagnac effect, in which an optical waveguide ring resonator is utilized as the sensing element [1-3].
Both use the Sagnac effect, which basically says that rotation of a closed optical path will affect the interference between two counterrotating light beams.
The synchronization problem is partly a result of the Sagnac effect, a phenomenon that causes clocks in a rotating system (in this case, the earth) to be out of sync with one another when viewed from a stationary frame.
After introducing the general principles of optical gyroscopes based on a recirculating Sagnac effect, the technical guide explains the solid state configuration of optical fiber gyroscopes, the reciprocity of a fiber ring interferometer, the behavior of polarization maintaining fibers, and closed-loop operation methods to linearize the scale factor.
Besides these he was the first person among the scientists, who had registered the Sagnac effect at radiowaves.
This is the Sagnac effect, a piece of physics so obscure that it does not even have an index entry in the 15-volume McGraw-Hill Encyclopedia of Science and Technology.
(Read more on the Sagnac effect and explanations of it in my recent papers [12,13].) It should also be noted that the Lorentz transformations lead to the relation c' = c, which differs from Tangherlini's formula (2).
The Sagnac interferometer is based on the Sagnac effect, reported by G.