Efek Sagnac: Perbedaan antara revisi

<!--

In 1926, an ambitious ring interferometry experiment was set up by [[Albert Abraham Michelson|Albert Michelson]] and [[Henry Gale (astrophysicist)|Henry Gale]]. The aim was to find out whether the rotation of the Earth has an effect on the propagation of light in the vicinity of the Earth. The [[Michelson–Gale–Pearson experiment]] was a very large ring interferometer, (a perimeter of 1.9 kilometer), large enough to detect the angular velocity of the Earth. The outcome of the experiment was that the angular velocity of the Earth as measured by astronomy was confirmed to within measuring accuracy. The ring interferometer of the Michelson-Gale experiment was not calibrated by comparison with an outside reference (which was not possible, because the setup was fixed to the Earth). From its design it could be deduced where the central interference fringe ought to be if there would be zero shift. The measured shift was 230 parts in 1000, with an accuracy of 5 parts in 1000. The predicted shift was 237 parts in 1000.<ref>Albert Abraham Michelson, Henry G. Gale: ''[http://adsabs.harvard.edu/abs/1925ApJ....61..140M The Effect of the Earth's Rotation on the Velocity of Light]'', in: ''The Astrophysical Journal'' 61 (1925), S. 140&ndash;145</ref>

 

: <math> t_1 = \frac {2 \pi R + \Delta L}{c} </math>

 

 

: <math> \Delta L = R \omega t_1. \, </math>

 

 

: <math> t_1 = \frac {2 \pi R }{c - R \omega}. </math>

Likewise, the light traveling in the opposite direction of the rotation will travel less than one circumference before hitting the light source on the front side. So the time for this direction of light to reach the moving source again is: