Fiber Optic Array Temperature Field Measurement System for High-Temperature Turbine Blades

Turbine blades are the core components of aeroengines, and the measurement of the blade surface temperature field is a top priority in aeroengine design, development, and health monitoring. In this article, a fiber optic array temperature field measurement system for high-temperature turbine blades is proposed. First, a high-temperature resistant probe was designed by using sapphire fiber arrays. Then, an array temperature field measurement system was built based on the principle of colorimetric thermometry. Finally, temperature field measurement experiments of blades are conducted by building a high-temperature field rotor test rig. The experimental results show that the maximum temperature measurement error of the system is 0.96% in the temperature measurement range of 1400-2000 K, and according to the proposed temperature field reconstruction algorithm, the 3-D temperature field reconstruction of the blade is achieved.