Advances in Civil Engineering / 2010 / Article / Fig 6

Research Article

Potential of Nonlinear Ultrasonic Indicators for Nondestructive Testing of Concrete

Figure 6

Experimenatl setup. FFT (C1) and FFT (C2) are respectively the typical frequency spectrums of LF and HF obtained in experiments. FFT (C2) illustrates the interaction of HF with LF.
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