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International Journal of Concrete Structures and Materials
Fig. 11 | International Journal of Concrete Structures and Materials

Fig. 11

From: Use of Higher-Harmonic and Intermodulation Generation of Ultrasonic Waves to Detecting Cracks due to Steel Corrosion in Reinforced Cement Mortar

Fig. 11

Relative amplitude evolution of the main components of the frequency spectrum of the received signal for specimen 10 (transducer emitter excited with 180 V). A1: relative amplitude of the fundamental frequency (f1 = 30 kHz). A2 and A3: relative amplitudes of the second and third harmonics, respectively, (f2 = 60 kHz and f3 = 90 kHz).

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