publication . Doctoral thesis . 2008

Nonlinear Interaction Between Ultrasonic Waves and Cracks and Interfaces

Poznic, Milan;
Open Access English
  • Published: 01 Jan 2008
  • Publisher: Stockholm : KTH
The subject of this thesis is the development of new ultrasound inspection techniques for detection of cracks that are smaller than the wavelength of the inspecting wave and the characterization of cracks in fluid-filled pipes as either surface-breaking or subsurface. The spectrum of the scattered field of a partially closed crack comprises harmonic components not expected to be found in the case of linear scatterers such as pores or inclusions. Paper A presents an experimental investigation into the linear reflection and generation of the 2nd harmonic component following the incidence of an ultrasonic wave onto a dry or water-confining interface formed by elast...
free text keywords: ultrasonic waves, crack, modulation, rough interface, partially closed, surface-breaking, fluid-filled, Acoustics, Akustik
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