Difference Between Laser Gyro and Fiber Optic Gyro

The basic components of the laser gyro are neodymium lasers, total reflection mirrors, and half mirrors. Its working principle is that in the closed optical path, the two light beams transmitted in the clockwise direction and counterclockwise direction emitted by the same light source interfere with each other, and the frequency difference between the two directions is measured.

Fiber optic gyroscopes are gyroscope-based sensors based on modern physics principles. The fiber optic gyroscope measures the phase difference of the light in two directions. The gyroscope will lock the phase difference of the light in two directions through the Y waveguide device. Because it has no moving parts – a high-speed rotor, it is called a solid-state gyroscope. It will become the leading product in the future, with a wide range of development and application prospects.

Both are optical gyros and based on the Sagnac effect. The difference is that one propagates in the fiber and one propagates in the cavity. The fiber is low in cost, but is susceptible to variations in thermal expansion and contraction due to temperature changes and tension changes during winding. The laser gyro light propagates in the resonant cavity and is affected little by the outside, so the precision is high, but the resonant cavity is expensive.

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