Research on Tip Clearance Measurement Technology of Aero-engine Blade Based on Optical Fiber Sensing System

Abstract A novel non-contact detecting method of aero-engine blade tip clearance based on an optical fiber sensing system is presented. To eliminate the sensor measurement error caused by slight change reflectivity value mechanical end face when light source angle fluctuates and rotates, a three-coil coaxial bundle proposed. Relevant experimental results show that has advantages high sensitivity, small probe volume, strong electromagnetic interference resistance, reliability. The application this technology provides effective for dynamic radial gap detection high-speed rotating machinery.