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What causes the Sagnac effect?
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[QUOTE="Drakkith, post: 6211291, member: 272035"] True, but that's not important. Because the interferometer is rotating, the light beams themselves travel different distances on each 'leg', or through the fiber optic cable if one is being used. The question isn't whether the coriolis effect causes the sagnac effect in general (it doesn't), but rather if the coriolis effect can give similar results as the sagnac effect in specific situations (maybe). The Earth is rotating, and objects at different latitudes experience different velocities with the those at the equator moving faster than those closer to the poles. The paper you linked claims: [I]Earth, just like all other physical objects, carries electromagnetic fields along with it at the vicinity of its surface. Therefore, Coriolis force due to the spinning of Earth must act on the propagation of light on the surface of Earth.[/I] Unfortunately I'm not experienced enough with electrodynamics and relativity to verify this claim. Note that the paper specifically talks about the Michelson-Gale experiment. It does not claim that the sagnac effect is always caused by the coriolis effect. This is trivial to demonstrate as false since merely rotating an interferometer in your hand will give the sagnac effect, and the magnitude of the change in the interference pattern changes directly with the angular velocity of the interferometer. [/QUOTE]
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What causes the Sagnac effect?
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