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

By Roman Gr. Maev

ISBN-10: 3527407448

ISBN-13: 9783527407446

The one up-to-date source on acoustic microscopy covers its use in quite a number purposes spanning the fields of physics, fabrics technology, electric engineering, drugs, and examine and industry.Acoustic Microscopy bargains special assurance of: acoustic box structureoutput sign formation in transmission raster acoustic microscopes non-linear acoustic results visco-elastic houses and microstructure of version structures and composites polymer composite fabrics microstructure and physical-mechanical houses of organic tissues and moreAcoustic Microscopy is a necessary reference for fabrics scientists, electric engineers, radiologists, laboratory medics, try out engineers, physicists, and graduate scholars.

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Extra info for Acoustic Microscopy: Fundamentals and Applications

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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. 23 24 2 Acoustic Field Structure in a Lens System of a SAM The effect of absorption on the acoustic field structure in the vicinity of the focal area can be expressed in terms of the parameter γ : γ = ln Pe Pp = αR 1 − cos θm N where Pe and Pp are the acoustic pressures at the edge and center of the wave front, and α is the absorption coefficient of the immersion liquid.

Therefore, the field of a transducer with an arbitrary aperture angle is calculated here using the transfer of the boundary conditions into the plane adjacent to the rear surface of the transducer. 3 Geometry of a spherical focusing trans- ducer: f is the radius of the curvature of the transducer, a is the transducer radius, and α is the aperture angle. 3 depicts a spherical focusing transducer with radius of curvature f , radius a, and aperture angle α. The normal component of the vibrational velocity on the transducer surface is constant and equals V0 .

3 Analysis of Acoustic Field Spatial Structure with a Spherical Acoustic Transducer and taking into account that the integral over ϕ equals 2πJ0 (sr0 )J0 (sf sin θ) [79, p. 206], we obtain the expression for the output signal V in terms of q(z0 , s): ∞ V = q(z0 , s)J0 (r0 s)F (s)s ds 0 Function α F (s) = 2πf 2 exp if k 2 − s 2 sin θ J0 (sf sin θ) sin θ dθ 0 is the function of the transducer sensitivity to various components of the incident radiation. Signal V is proportional to potential (z0 , r0 ) at the center of curvature of the receiving transducer, only if F (s) is independent of s.

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