AUTHOR=Han Jibo , Bai Yu , Lv Linjie , Wu Tengfei , Wu Yahui , Cao Zhang , Yang Yongjun TITLE=Dynamic and high-speed measurement system for blade tip clearance of engine with optical comb JOURNAL=Frontiers in Physics VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1036485 DOI=10.3389/fphy.2022.1036485 ISSN=2296-424X ABSTRACT=

For blade tip clearance measurement, the optical measurement method has the characteristics of high precision, anti-electromagnetic interference, and non-contact measurement. A dynamic and high-speed blade tip clearance measurement system based on time stretch dispersive Fourier transform with the optical comb is proposed and demonstrated. The dynamic experiments are designed to verify the accuracy of the system. The results show that the measuring speed is up to 17.6 MHz and the measurement errors are less than 1 μm under dynamic conditions. The experiments prove that the system has the advantages of high measurement accuracy, high speed, and good repeatability. It can provide a new tool for engine health monitoring.