A high sensitivity inductive sensor for blade tip clearance measurement

被引：29

作者：

Du, Li ^{[1
]}

Zhu, Xiaoliang ^{[1
]}

Zhe, Jiang ^{[1
]}

机构：

[1] Univ Akron, Dept Mech Engn, Akron, OH 44325 USA

来源：

SMART MATERIALS AND STRUCTURES | 2014年 / 23卷 / 06期

关键词：

blade tip clearance; inductive sensor; signal multiplexing; real-time health monitoring; TURBOMACHINERY;

D O I：

10.1088/0964-1726/23/6/065018

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A multiplexed inductive sensor consisting of multiple mini-sized planar spiral coils for detecting multiple tip clearances of rotor blades is presented. The sensor measures the tip clearances by monitoring the inductance changes of planar spiral coils caused by the passage of the rotor blades. A resonance frequency division multiplexing technique and parallel LC resonance measurement were applied to the multiple sensor coils, making it feasible to measure multiple tip clearances using only one set of measurement electronics with high sensitivity and resolution. The results from tests conducted on a bench-top test rig have demonstrated that the sensor is capable of simultaneously measuring multiple tip clearances from 0 to 5 mm with a 10 mu m resolution at a high rotary speed up to 80 000 RPM. With its high resolution, high sensitivity and capability of monitoring a large number of tip clearances simultaneously, this sensor can potentially be used for advanced active tip clearance control in turbine machinery.

引用

页数：9

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