Study on metallization protection and installation method of fiber optic sensor transmission line in aero engine

Aiming to meet the high reliability requirements of fiber optic sensor line layout in aero engine measurements under high temperature and high-speed conditions, a method for fiber metallization protection and installation is proposed. A finite element model was established for the welding process of a metallized protective structure, and the thermal-electric-force coupling method was used to simulate the evolution of the temperature field. The research shows that by applying pulse current, the inner temperature of the tube gradually exceeds the outer temperature. Therefore, in order to protect the internal fiber, it is necessary to increase the intensity of the pulse current as much as possible and shorten the duration of the pulse current.