Performance comparison among three optical fibre-based displacement sensors for Blade Tip Clearance measurements

The present document shows the results of a comparison among three different Blade Tip Clearance (TC) optical fibre-based reflective displacement measurement systems (two custom design sensors and a commercial sensor) that have been tested in a real stage of a turbine rotor. Results so far show that custom designed sensors offer better performance, and that the front slope region offers better resolution and accuracy than the back slope region.