High Sensitive Methods for Health Monitoring of Compressor Blades and Fatigue Detection
Figure 19
Showing (a) an idea and a block structure of the tip timing method; (b) a shape of analog signal for vary reluctance (VR), optical and eddy current (EC) sensor. Signal with VR and EC sensors also contains information about magnetizing blades; (c) main problem of VR and EC sensors—precise relation of the analog signal with putting the top of the blade with regard to the sensor (Where is the blade? Which point of the blade top is in the relation with the characteristic point of the analog signal?) [25].
