High precision fiber optic gyroscope based on ultra-thin fiber

With the development of application system and the progress of optical device technology, engineered FOGs are developing towards miniaturization, lightweight and high-precision. A small high-precision FOG based on a new type of ultra-fine diameter (60/100) fiber is designed. Compared with the traditional thin diameter polarization maintaining fiber, the new ultra-thin diameter fiber can increase the bending resistance of the fiber and reduce the winding radius of the fiber coil. At the same time, due to the thinning of the fiber, the thickness of the fiber coil decreases. When the ambient temperature changes, the temperature difference between the inner and outer layers of the fiber decreases, which is conducive to improving the full temperature performance of the ring and the temperature characteristics of the FOG. Firstly, the core and cladding structure design of a new ultra-thin diameter fiber is designed. On this basis, the degradation model of colloidal materials with time is established in order to improve the reliability of coated and looped colloidal materials. Then, based on the new fiber and miniaturized broadband ASE light source, the miniaturized high-precision FOG is successfully built. The size of the FOG is 70 mm×70 mm×35 mm, bias stability could reach 0.007°/h, which can meet the requirements of miniaturization, lightweight and high precision of the gyroscope. © 2022, Editorial Department of Journal of Chinese Inertial Technology. All right reserved.