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Sensors 2017, 17(5), 1097; doi:10.3390/s17051097

A Blade Tip Timing Method Based on a Microwave Sensor

1
State Key Laboratory of Precision Measuring Technology and Instruments; Tianjin University, Tianjin 300072, China
2
China Gas Turbine Establishment; Chengdu 610500, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 22 March 2017 / Revised: 7 May 2017 / Accepted: 8 May 2017 / Published: 11 May 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3640 KB, uploaded 11 May 2017]   |  

Abstract

Blade tip timing is an effective method for blade vibration measurements in turbomachinery. This method is increasing in popularity because it is non-intrusive and has several advantages over the conventional strain gauge method. Different kinds of sensors have been developed for blade tip timing, including optical, eddy current and capacitance sensors. However, these sensors are unsuitable in environments with contaminants or high temperatures. Microwave sensors offer a promising potential solution to overcome these limitations. In this article, a microwave sensor-based blade tip timing measurement system is proposed. A patch antenna probe is used to transmit and receive the microwave signals. The signal model and process method is analyzed. Zero intermediate frequency structure is employed to maintain timing accuracy and dynamic performance, and the received signal can also be used to measure tip clearance. The timing method uses the rising and falling edges of the signal and an auto-gain control circuit to reduce the effect of tip clearance change. To validate the accuracy of the system, it is compared experimentally with a fiber optic tip timing system. The results show that the microwave tip timing system achieves good accuracy. View Full-Text
Keywords: blade tip timing; blade vibration measurement; microwave sensor blade tip timing; blade vibration measurement; microwave sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, J.; Duan, F.; Niu, G.; Jiang, J.; Li, J. A Blade Tip Timing Method Based on a Microwave Sensor. Sensors 2017, 17, 1097.

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