Patent ID: 8217663
Filing Date: 2012-07-10
Classification: F01D,F05D,G01B,G01S

Abstract:
1. A method for determining a layer thickness of a thermal barrier coating (TBC) on at least one rotor blade of a continuous flow machine, comprising: transmitting an electromagnetic wave at a surface of the rotor blade, the electromagnetic wave being transmitted with an original phase and at a frequency matched to the layer thickness of the TBC coating and being transmitted at a location between two successive blade rows of the continuous flow machine, the frequency being in the range between 30 GHz and 130 GHz; at least partially reflecting the electromagnetic wave at the rotor blade to produce a reflected component having a changed phase that differs from the original phase; receiving the reflected component and performing a phase comparison of the original phase with the changed phase; and determining the layer thickness of the TBC coating based on the phase comparison.