Why Do RLG And FOG Measure Different Light Paths?

Fiber optic gyroscopes measure the phase difference between two directions of light, and the gyroscope locks the phase difference between the two directions through a Y waveguide device.In order to improve the phase difference/RPM coefficient, a larger enveloping area is required, i.e. a longer optical fiber is required

The laser gyro measures the frequency difference between the two directions of light, and the smaller the surrounding area can have a more obvious frequency difference.The speed of laser gyroscope is indicated by fringe counting, which does not need closed-loop control

Fiber optic gyroscope (FOG) can also be measured in a similar way to laser gyroscope in principle, but the various optical effects that occur in practice make this method difficult to achieve.

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