Guo Haotian, Duan Fajie, Wu Guoxiu, Zhang Jilong
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China.
Rev Sci Instrum. 2014 Nov;85(11):115105. doi: 10.1063/1.4901601.
The blade tip clearance is a parameter of great importance to guarantee the efficiency and safety of the turbine engines. In this article, a laser ranging system designed for blade tip clearance measurement is presented. Multi-mode fiber is utilized for optical transmission to guarantee that enough optical power is received by the sensor probe. The model of the tiny sensor probe is presented. The error brought by the optical path difference of different modes of the fiber is estimated and the length of the fiber is limited to reduce this error. The measurement range in which the optical power received by the probe remains essentially unchanged is analyzed. Calibration experiments and dynamic experiments are conducted. The results of the calibration experiments indicate that the resolution of the system is about 0.02 mm and the range of the system is about 9 mm.
叶片尖端间隙是保证涡轮发动机效率和安全性的一个非常重要的参数。本文介绍了一种设计用于测量叶片尖端间隙的激光测距系统。采用多模光纤进行光传输，以确保传感器探头接收到足够的光功率。给出了微型传感器探头的模型。估计了光纤不同模式的光程差所带来的误差，并限制光纤长度以减小该误差。分析了探头接收光功率基本保持不变的测量范围。进行了校准实验和动态实验。校准实验结果表明，该系统的分辨率约为0.02毫米，测量范围约为9毫米。
