By Roman Gr. Maev
The one up-to-date source on acoustic microscopy covers its use in more than a few functions spanning the fields of physics, fabrics technological know-how, electric engineering, medication, and learn and industry.Acoustic Microscopy deals distinctive 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 homes of organic tissues and moreAcoustic Microscopy is a vital reference for fabrics scientists, electric engineers, radiologists, laboratory medics, try engineers, physicists, and graduate scholars.
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Extra info for Acoustic Microscopy: Fundamentals and Applications
In the focal plane, absorption causes narrowing of the principal maximum and an increase in the amplitude of subordinate maxima at small aberrations. 2 The Field of a Spherical Focusing Transducer with an Arbitrary Aperture Angle Converging wave fronts are calculated using two basic approaches. With the ﬁrst approach , the Helmholtz–Huygens integral is taken over the wave-front surface. The linear dimensions of this surface are assumed to be great compared to the sound wavelength in the medium, which makes it possible to approximate the integration surface by a large array of almost planar sections with dimensions exceeding the wavelength.
5) 0 where J0 is the zero-order Bessel function. 2) that, at α = π/2, the “shadow” region is missing in the z = 0 plane. 6b) 27 28 2 Acoustic Field Structure in a Lens System of a SAM where q = z − f , p = z + f , q 2 + r 2 is the distance from the center of curvature, εm = 1 at m = 0 and εm = 2 at m > 0, and J2m is the Bessel function. 6), the ﬁeld structure is represented in the form of three terms: the ﬁrst describes the point source placed at the center of curvature of the transducer (geometrical–acoustics approximation), while the second and the third are the corrections for diffraction.
Therefore, the ultrasound frequency is to be selected after taking into account the properties of the object and the problem to be solved and reasonably compromising between the penetration depth and resolution. It is ultrasound radiation which permits one to obtain new information about the mechanical properties of a micro-object that cannot be provided by other microscopic methods. Currently, we can formulate the following basic points of acoustic microscopy development: • • • • • • • The development of physical grounds and the search for new foundations of acoustic microscopy.
Acoustic Microscopy: Fundamentals and Applications by Roman Gr. Maev