Temperature Field Finite Element Analysis of the Ultra-high Temperature Borehole Inclinometer based on FOG and Its Optimization Design

This paper puts forward a design method of ultra-high temperature borehole inclinometer based on fiberoptical gyroscope, and this borehole clinometer can be used for measuring the borehole trajectory and its bending value in ultra-high temperature, and the maximum outer temperature is not more than 270℃, and it also can control the internal temperature below 125℃ with the help of the metal vacuum flask. The measurement principle is strapdown inertial navigation system, the strapdown inertial navigation system is composed of three axis fiber-optic gyroscopes and three axis accelerometers. In this paper, temperature field of fiber-optic gyroscope is simulated on the basis of considering unified formula of thermal induced error and the heat dissipation of the internal components, the optimization design is verified through the cloud chart of metal vacuum flask temperature distribution. The measuring instrument can work in these deep-holes, and its technology will promote the development of drilling technology.