Figure 3. Difference between non-vibrating and vibrating blade seen by a sensor

From

Turbine Blade Vibration Measurement Methods for Turbocharges

G Janicki, A Pezouvanis, B Mason, M K Ebrahimi

American Journal of Sensor Technology. 2014, 2(2), 13-19 doi:10.12691/ajst-2-2-1