Table 1.

Tip clearance measurements obtained during turbine tests.

Working Point (rpm)	Discharging Probe Tip Clearance (mm)	Optical Sensor Tip Clearance (mm)	Difference (%)
3148.52	2.890	2.954	2.22
3390.71	2.919	2.961	1.42
3632.91	2.893	2.843	1.72
3875.10	2.851	2.840	0.38