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This study presents early results for a localized, in-situ sensing approach for detecting cracks in turbine engines. A wireless slip ring system was developed for capturing and transmitting acoustic emissions data from rotors during operation. The wireless communication between the rotor and the stator is accomplished through capacitive coupling. The antennas are fashioned as a ring within a ring set-up. Here, tests were conducted under both static and rotating conditions in order to document the abilities of the system concerning signal accuracy after modulation and demodulation. Results showed that the prototype wireless slip ring was able to accurately recreate fixed frequency or arbitrary input signals, generated using a pulse/function generator or lead breaks imitating fracture events, in the frequency range of a few hundred Hz to 850 KHz. Planned improvements as well as strategies for implementation are also discussed.Copyright © 2010 by ASME |
