The Noise Analysis And Experiment Study On Interferometric Fiber Optic Gyroscope

Fiber optic gyroscope (FOG) is one of the classical applications of the fiber sensor technology. As an important inertia sensing device, it is used to measure its carrier's directional angle and rotational velocity, which makes it the basic core in the inertia system. Since FOG has a series of advantages which can't be found in the ordinary mechanical gyroscope, it has been developed quickly to be the new mainstream instrument of inertia technology field.Interferometric fiber optic gyroscope (I-FOG) is the earliest developed,the most mature and the most widely applied fiber gyroscope. And at the moment, the research and development of its inertia level product is becoming more and more mature. But because of some random and nonreciprocal factors, the improvement of its performance has been deeply influenced. How to restrain the various noise of I-FOG has become the domestic hot spot these days.The general work of this thesis is finding out the main factors which influence the precision most and both finding out the best effective measures to improve the precision. This paper summarizes the development situation of the fiber gyroscope and the comparison among different FOGs, points out the strategy and advantages of FOG. Then it detailed introduces the development condition and the trend, expounds the sagnac effect and the operating principle of the I-FOG. After that, we proposed the optimal structure of the I-FOG which we prepared to develop, and for the first time we theoretic analysis the polarization based on this structure which includes a LiNbO₃ integrated wave guide, put forward some effective measure. At last, we explain the main work in our development of an I-FOG, design an electric circuit for stabilization of the light source, and study the fiber ring's temperature field by finite difference method, point out the remain temperature noise and proposed a novel winging way for fiber ring. Finally we present the performance parameter of the I-FOG which we successfully developed independently.