Presenting a New Wireless Strain Method for Structural Monitoring: Experimental Validation

Figure 14

Spectrum of the signal of Figure 13: the continuous component (frequency zero) depends on the part of the signal corresponding to the static condition of the cantilever, the peak at 33.14 Hz is the natural frequency of vibration of cantilever, and the small peak at 50 Hz is the hardware noise (supplying network of the central unit).