FOG
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What is the definition of FOG?
Stands for fibre-optic gyroscope. A FOG is an optical gyroscope that uses narrowband light waveforms traveling through fibre-optic coils to measure rotation based on the Sagnac effect.
In the graphic, the FOG is rotating about the Z-axis. During rotation, the phase shift of the light can be seen as a difference in arrival time of the two light beams at the optical receiver. Phase shift in the light occurs only during rotation; once the rotation stops, the light will again be in phase. Note that this is for illustrative purposes only and not necessarily a depiction of the actual technology.