Phase shift and frequency shift
in Sagnac experiment
Summary: Both a phase shift and a frequency shift have been obtained with the Sagnac experiment. The phase shift was discovered by Sagnac in 1913. It implies accelerations so that it can be explained only by the General Relativity theory. Attempts to explain this result by a Euclidian approximation failed as it leads to the Selleri?s paradox.
Sagnac favours an explanation by an ether motionless with regard to the laboratory.
Pr Stedman noticed that a frequency shift is also occurring enabling to detect the Sagnac device rotation.
This report is intended for explaining the frequency shift.
