Over the last years, both the aeroengine and the 
stationary gas turbine industry have deployed intensive 
efforts into research on blade monitoring sensors because 
of their potential in terms of advanced structural and 
aeromechanical condition monitoring. These sensors provide 
the capability of measuring blade tip clearance and blade 
time of arrival, which in turn can allow the detection of 
faults such as blade erosion, rubbing, cracking, high 
cycle fatigue. Still, a variety of clearance sensors exist 
together with specific data reduction techniques but are 
still used in laboratory environments, not yet on engines 
in commercial service. During this Lecture Series, world 
experts will present the fundamentals of sensor technology 
and measurement chain, and examples of applications in 
fans, compressors and turbines showing the different data 
analysis techniques allowing to interpret clearance 
evolutions, blade vibrations, crack detection, etc. Their 
different contributions should allow to set new 
perspectives for the future developments in this area.