Acoustic Microscopy: Fundamentals and Applications by Roman Gr. Maev PDF

Acoustics Sound

By Roman Gr. Maev

ISBN-10: 3527407448

ISBN-13: 9783527407446

ISBN-10: 3527623140

ISBN-13: 9783527623143

The one up to date source on acoustic microscopy covers its use in a number of functions spanning the fields of physics, fabrics technological know-how, electric engineering, medication, and learn and industry.Acoustic Microscopy deals specified assurance of: acoustic box structureoutput sign formation in transmission raster acoustic microscopes non-linear acoustic results visco-elastic homes and microstructure of version structures and composites polymer composite fabrics microstructure and physical-mechanical houses of organic tissues and moreAcoustic Microscopy is an important reference for fabrics scientists, electric engineers, radiologists, laboratory medics, try out engineers, physicists, and graduate scholars.

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Sample text

Measuring the two shifts by the method of A(z) characteristics, one can assess local distributions of the velocities of both longitudinal and transverse acoustic waves in the material [65]. Bifurcation of the maximums of the A(z) curve was observed in studies of a dry gelatin film 7 microns thick at the same parameters of the setup (450megahertz frequency, lens aperture of 30◦ ) using mercury as an immersion liquid. Measurement of the two maximums permitted the longitudinal and shear wave velocities in the sample to be calculated and the vanishing of the shear modulus to be traced in samples swollen with water [66].

Current Development nal [53] or at combined frequencies [54] rather than at the frequency of the input signal itself. In this case, both linear and nonlinear object properties contribute to the measurement results. An interference technique in the transmission microscope operation mode was suggested in [55] to measure local speeds of sound. The V (z)-characteristics method described in detail below is at present the most advanced technique for measuring local values of the velocity of Rayleigh waves spreading over the surface of samples studied.

2). This is because the main contribution to the amplitude distribution in this plane comes from the rays arriving from the central region of the lens and tilted at a small angle to the acoustic axis. 2). At the high frequencies used in acoustic microscopy, one has to take into account absorption in the immersion liquid which, in addition to general attenuation of the signal, leads to a nonuniform amplitude distribution along the converging front. This is because the path of peripheral rays in the liquid is shorter than that of paraxial rays, and hence they are absorbed to a lesser extent.

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Acoustic Microscopy: Fundamentals and Applications by Roman Gr. Maev

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