Monitoring thermal barrier coating deterioration via...

Measuring and testing – Vibration – By mechanical waves

Reexamination Certificate

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C073S602000, C073S660000

Reexamination Certificate

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07062971

ABSTRACT:
A method of monitoring the condition of a thermal barrier coating on a turbine blade or vane during operation of the turbine is provided. The method includes providing a means for receiving acoustic output of the blade or vane during operation of the turbine and monitoring the acoustic output over time, to determine the condition of the thermal barrier coating on the blade or vane. The acoustic output arises from a force on the blade or vane, such as that due to impact of particles, a pulse of gas pressure or constant gas flow. An apparatus employing the above method for monitoring the condition of the thermal barrier coating during operation of the turbine, is also provided.

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US 2003/0056595, Acoustic monitoring of foreign objects in combustionturbines operation, Mar. 27, 2003.

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