Ring Laser and Fiber Optic Gyroscope Calibration Against Celestrial Movement

[Foxxz]

Since the Ring Laser and Fiber Optic gyroscopes depend on the speed of light being a constant - How does the rotation and orbit of Earth affect calibration and the data that these devices produce? If we expand out further you might consider the travel of our solar system through the galaxy. I'm going to guess that the macro-movements and constant velocities of these macro-movements don't really show up well in the data or are presented as noise. But it had me wondering.

[ejeffrey]

Sufficiently accurate ring laser gyroscopes can definitely measure the rotation of the earth and even slight wobbles in that rotation.

[jonpaul]

INS and GPS>> speed

Einstein equations for correction speed of light.

j

[mawyatt]

RLG and FOG operate on slightly difference principles, the RLG in the Frequency Difference between two counter rotating HeNe Laser Beams within a cavity and the FOG with the Phase Difference of the counter rotating beams within the Optical Fiber, both when exposed to rotation.

In early 80s FOG development Earth Rate was the limiting noise factor until a researcher discovered the FOG Transfer Function was asymmetrical when moving forward and backward thru time, while the RLG was symmetrical. Once new symmetrical FOG architectures were developed the FOG performance soon equaled the RLG and well below Earth Rate.

The RLG performance was limited by the HeNe Laser path length, paths too long won't Laze and thus limit the "Exposed Area" of the RLG which determines the sensitivity (among many other things), whereas the FOG benefited from "Exposed Area" with larger diameters or/and multiple turns of the Fiber such as wound on a spool.

The RLG had issues with the Counter Rotating Laser Beams Injection Locking at low rotation rates causing a dead zone which was solved by various "Dithering Methods". The FOG performs with the Interference Pattern which is non-linear (Sine) and one solution by operating the FOG in a Closed Loop where the function is linear at "Zero" crossing. A technique we developed which shifted the Optical Frequency of the FOG Laser Signal by means of a Serrodyne Function to "Close the Loop" operating at the Interference Sine "Zero" crossing, and later patented such (5339055).

Best,