No abstract

It has been demonstrated that Fiber Bragg Grating Sensors can measure at very low temperatures in Helium cryostats. The intrinsic temperature sensitivity is very low but can be significantly enhance by the thermal expansion of polymer carriers. Temperature and mechanical strain changes can be measured quite accurately.

This paper reports on the first realisation of embedding fiber Bragg grating temperature sensors inside the stator bars and onto the leads of a 200MVA air cooled power generator. The worlds first measurements of the conductor temperature on high potential during a generator prototype test run demonstrates the feasibility and importance of this measuring technology.

No abstract

Gas turbines for power generation are being operated on the physical limits of materials and structures. A save operation requires more monitoring of critical components. Optical, acoustic and RF waveguides could be used to access the harsh environment inside of gas turbines for monitoring purposes.