When an ultrasonic wave is reflected from an interface, a phase shift that is dependent on the angle of incidence may occur. If the wave is nonsinusoidal, this phase shift causes relative spatial shifting of the Fourier harmonic components. The assumption of independent reflection of the Fourier harmonics allows the use of linear theory to calculate the change in the phase angle between the fundamental and the second-harmonic components in the distorted wave. A pulse technique is used to measure this change in phase angle. Agreement between theory and experiment is good for the phase shift upon reflection from water-copper, from water-duralumin, and from water-mica-glycerin interfaces when correction is made for finite-amplitude effects between the interface and the receiving transducer.
No takes yet. Share an insight, caveat, or question.
Buren et al. (1968) studied this question.