Temperature measurement of parts of a turbomachine

For the pyrometric temperature measurement in one of up to 1500 ° C hot part of a gas turbine, for example, its blade or wall, it is suggested to use a glass fiber. On the part itself a Scharzkorperflache is provided. The end of the fiber keeps a distance, for example 1-5 mm, from the black body surface in order to prevent the thermal degradation of the fiber. The heat radiation from the black body surface is collected by the optical fiber. The black body surface is adjusted in its size to the field of view of the fiber. Alternatively or additionally, a lens at the end of the fiber is provided.