As an extension from previous studies concerning the interaction of light with ultrasound of a purely sinusoidal form, two theoretical models describing light diffraction by ultrasonic pulses are derived starting from the Maxweli equations. Based on a generating function, the first model provides finite solutions for the amplitudes and intensities of the diffraction pattern and is restricted in...

The measurement of the acoustic pressure of a planar ultrasonic wave by light diffraction is well established. The ability to do similar measurements in the case of spherical waves has been doubted However, we show that the range of validity can be extended to the focal region of a spherical concave piezoelectric transducer. Light is passed through the focal plane of a spherical concave transdu...

Montmorillonite/ZrO2 nanocomposites were prepared by the sol-gel method underultrasonic irradiation. The montmorillonite was incorporated into Zirconium gel. After stirring for 24 hr, the mixture was irradiated for 30 min under ultrasonic irradiation. The filtrated composite gel was calcinated at 400°C for 3h in furnace. The morphology of prepared catalysts was characterized by field emis...

Introduction Crystalline materials are generally elastically anisotropic. Even cubic materials are characterized by three elastic constants, whereas isotropic elastic material has only two. To define elastic anisotropy for the cubic materials, it is common to use the elastic anisotropy factor S = S11-S12S44/2 or A = 2(S11-S12)/S44, where Sij are elastic compliances. Materials become isotropic w...

Ultrasonic spectrum analysis is used to study the frequency and angular behavior of diffracted longitudinal waves from elliptical cracks with arbitrary orientation in diffusion bonded titanium alloy. The aspect ratio of the cracks (ratio of major to minor axis) ranged from l to 8 and the bandwidth of the input signal was such that the scattering diameter was ka > l. The experimental data are an...