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Microwave Sensor for Blade Tip Clearance and Structural Health MeasurementsThe use of microwave based sensors for the health monitoring of rotating machinery is being explored at the NASA Glenn Research Center. The microwave sensor works on the principle of sending a continuous signal towards a rotating component and measuring the reflected signal. The phase shift of the reflected signal is proportional to the distance between the sensor and the component that is being measured. This type of sensor is beneficial in that it has the ability to operate at extremely high temperatures and is unaffected by contaminants that may be present in the rotating machinery. It is intended to use these probes in the hot sections of turbine engines for closed loop turbine clearance control and structural health measurements. Background on the sensors, an overview of their calibration and preliminary results from using them to make blade tip clearance and health measurements on a large axial vane fan will be presented.
Document ID
Document Type
Conference Paper
Woike, Mark R.
(NASA Glenn Research Center Cleveland, OH, United States)
Bencic, Timothy J.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
May 5, 2008
Subject Category
Structural Mechanics
Report/Patent Number
Meeting Information
54th International Instrumentation Symposium (ISA)(Pensacola, Fl)
Funding Number(s)
WBS: WBS 984754.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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