METHOD FOR DETERMINING THE LAYER THICKNESS OF A TBC COATING OF AT LEAST ONE BLADE OF A NON-POSITIVE-DISPLACEMENT MACHINE, A CORRESPONDING TBC LAYER THICKNESS MEASURING DEVICE FOR CARRYING OUT THE METHOD AND USE OF THE METHOD AND THE TBC LAYER THICKNESS MEASURING DEVICE

摘要

The invention relates to a method for determining the layer thickness of a TBC coating of at least one blade (4, 11) of a non-positive-displacement machine (1). To this end, at least one electromagnetic wave is emitted to the surface of the at least one blade (4, 11), the at least one electromagnetic wave is then at least partially reflected by the at least one blade (4, 11), and the reflected portion of the at least one electromagnetic wave is received and subsequently processed. In addition, the at least one electromagnetic wave is emitted with a frequency matched to the layer thickness of the TBC coating, and the phase of the at least one electromagnetic wave is compared with the phase of the at least one received electromagnetic wave. The at least one emitted electromagnetic wave undergoes a phase change during reflection and the layer thickness of the TBC coating is determined by the phase comparison. The invention also relates to a TBC layer thickness measuring device for carrying out the method, to a use of the method and to a use of the TBC layer thickness measuring device.