There are many ways to classify fiber optic gyroscopes. According to the working principle, it can be divided into three types: interference type, resonant type and stimulated Brillouin scattering fiber gyro. Among them, the interferometric fiber optic gyroscope is the first generation of fiber optic gyroscope, which uses multi-turn fiber coil to enhance the Sagnac effect. It is currently the most widely used; it can be divided into open-loop fiber gyroscope and closed loop according to different electric signal processing methods. Fiber optic gyroscopes, in general, closed-loop fiber optic gyroscopes have higher precision due to closed-loop control; they can be divided into single-axis fiber gyroscopes and multi-axis gyroscopes according to structure, among which three-axis fiber gyroscopes are small in size. The measurable spatial position is therefore an important development direction of fiber optic gyroscopes.
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