Finite Element Analysis Of Temperature Filed Of Fiber Optical Gyroscope

Fiber Optical Gyroscope (FOG) is sensitivity with the change of external circumstance. Conduction, convection and radiation, which produce the change of energy of FOG, will cause the nonreciprocal phase noise and restrict the developing of high precision FOG. In order to analysis and optimize the thermal design of three-axis FOG, we present the finite element method to investigate the temperature characteristic of this FOG. First, the three-dimension model is dealt with to suite for numerical calculation. The small holes are filled. Second, the thermal parameters, such as the convection exchange coefficients, are determined by using the method of linear approximation. Finally, in term of the parameters given in second step we carry out some extensive calculation, which will make the base of temperature compensation.In order to explain the reason why there is a sudden change when this type of FOG subjected to heat flux, we investigate the numerical calculation of displacement temperature coupling analysis. It is shown that despite the temperature change of FOG is small, the deformation of the FOG is large. Considering the effect of temperature layer, carry out the simulation analysis of the surface of the FOG smear with temperature layer. The results show that temperature layer can effectively prevent the temperature change of FOG acted by heat flux and the deformation of the FOG can also become small when the temperature layer take effect.