Study on the Influence of Gravity Field on the Sensitivity of Thermal Expansion Fluidic Gyroscope

In this paper, the influence of gravity field on the sensitivity of thermal expansion fluidic gyroscope is studied. A three-dimensional model of thermal expansion gyroscope is established, and the influence of gravity field on temperature difference between thermistors is calculated by COMSOL Multiphysics software. The results show that the temperature field is distributed symmetrically in the cavity with angular rate applied, and the temperature difference between thermistors will also change due to Coriolis force. The influence of gravity field on gyro sensitivity increases with the increase of angular rate. The effect of gravity field on gyro sensitivity in 3D model cannot be ignored. In range of ±25rad/s, the sensitivity is 2.055×10
^-5
K/rad/s with gravity field, and the nonlinearity is 5.69%.