Overview—Nonlinear Ultrasonic Characteristics
Nonlinear ultrasonic characteristics are the features that result from the nonlinear interactions between the propagating ultrasonic waves and the material or defects, which typically include higher harmonic generation, sub-harmonic generation, nonlinear resonance and nonlinear frequency-mixing. In this book, such nonlinear interactions are divided into two categories, namely the material elastic nonlinearity and the contact acoustic nonlinearity, and the methodologies to measure the nonlinear ultrasonic characteristics associated with each category will be introduced with the corresponding applications.
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