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Acoustic Microscopy: Fundamentals and Applications by Roman Gr. Maev

By Roman Gr. Maev

The one up to date source on acoustic microscopy covers its use in a variety of purposes spanning the fields of physics, fabrics technology, electric engineering, medication, and learn and industry.Acoustic Microscopy bargains precise assurance of: acoustic box structureoutput sign formation in transmission raster acoustic microscopes non-linear acoustic results visco-elastic houses and microstructure of version platforms 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, attempt engineers, physicists, and graduate scholars.

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1) is the heart of a scanning acoustic microscope (SAM). An ultrasonic wave is generated in the acoustic lens system by a transducer mounted at one of its ends. The wave spreads through an acoustic duct possessing a large acoustic impedance and is then focused with the aid of a spherical recess (lens) at the other duct end in an immersion material (liquid as a rule) filling the space between the lenses and objects examined. The immersion liquid provides a large refractive index for the acoustic lens and good acoustic contact between the duct and object.

Current Development A(z) curve is displaced toward smaller z, if the speed of sound in the plate exceeds the speed of sound in the immersion liquid, and toward greater z, if the ratio of the acoustic velocities reverses. The shift of the A(z) maximum is proportional to the difference between the speeds of sound in the immersion liquid c0 and in the object c, and to the sample thickness Z = d(c/c0 − 1). A local value of the speed of sound in a zone 5 or 10 µm in size can be assessed by measuring Z.

The region to be studied must be neither too close to the radiator surface nor too deep in the far zone: (a/k)1/2 ≡ zg < z < zl ≡ kaf . The foregoing is illustrated below by the results of numerical calculation of the output signal of a focusing transducer (kf = 50, α = π/2) with the center of curvature scanned along the acoustic axis of a planar transducer with ka = 20. 7. These distributions match almost exactly at kz > 5 and kz < 200 (the near-zone boundary for the planar transducer was kzn = 64).

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