Influence of Methods for Fixing a Frameless Fiber Coil on Temperature Dependence of the FOG Output Signal

Parasitic effects in the coil of a fiber-optic gyroscope (FOG) significantly limit its accuracy. In particular, the elastic-optical effect is one of the main causes of the FOG temperature-dependent zero bias. The latter is due to the difference in the thermomechanical parameters of the coil components: optical fiber with a protective polymer coating, impregnating compound, and the frame. One of the possible ways to reduce the impact of this effect is to use a frameless coil that has less deformation under varying temperature conditions than a coil with a frame. The paper discusses the methods for fixing a coil of this type, their advantages and disadvantages. The experimental results of testing a FOG with a frameless coil fixed between two metal disks and buffer gaskets obtained for different distances between the disks and the material of the gaskets are presented. The results are compared with similar data for a coil with one side glued to the base.