Acoustic Microscopy: Fundamentals and Applications by Roman Gr. Maev

By Roman Gr. Maev

The single 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, drugs, and study and industry.Acoustic Microscopy bargains targeted insurance 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 vital reference for fabrics scientists, electric engineers, radiologists, laboratory medics, try out engineers, physicists, and graduate scholars.

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4 Geometry of the system: 1 – receiving transducer, 2 – its acoustic axis, and 3 – radiator axis. This implies that the above-mentioned approximation is inaccurate for certain types of fields. In this context, it would be pertinent to revert to a theoretical justification of the method in order to establish all types of acoustic fields, the local parameters of which can be measured by the method. The analysis is performed within the framework of the concept of a spatial spectrum of an acoustic field.

On the other hand, the aperture angle was supposed to be small in [71] merely for convenience of the field calculations. 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 vibrational velocity potential at the observation point is a superposition of the fields induced by point sources having equal amplitudes and different phases and located on the lens surface S [67]: = V0 2π S exp(−ikr − iϕ) dS r where V0 is the vibrational velocity on the lens surface, ϕ is the phase distribution formed on the lens surface as a plane wave impinges on it, and r is the distance to the observation point. The above-derived field distribution along the acoustic axis and in the focal plane of the lens can be compared with the familiar expressions for a spherical focusing transducer.

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