Acoustical Imaging: Techniques and Applications for by Woon Siong Gan

By Woon Siong Gan

The know-how of acoustical imaging has complicated speedily over the past sixty years, and now represents a cosmopolitan strategy utilized to a variety of fields together with non-destructive trying out, scientific imaging, underwater imaging and SONAR, and geophysical exploration. Acoustical Imaging: strategies and purposes for Engineers introduces the elemental physics of acoustics and acoustical imaging, earlier than progressing to extra complex themes equivalent to 3D and 4D imaging, elasticity concept, gauge invariance estate of acoustic equation of movement and acoustic metamaterials. the writer attracts jointly the various applied sciences in sonar, seismic and ultrasound imaging, highlighting the similarities among subject components and their universal underlying theory.

Key features:

  • Comprehensively covers the entire very important purposes of acoustical imaging.
  • Introduces the gauge invariance estate of acoustic equation of movement, with purposes within the elastic constants of isotropic solids, time reversal acoustics, destructive refraction, double detrimental acoustical metamaterial and acoustical cloaking.
  • Contains brand new remedies on most modern theories of sound propagation in random media, together with statistical therapy and chaos theory.
  • Includes a bankruptcy dedicated to new acoustics in response to metamaterials, a box based through the writer, together with a brand new conception of elasticity and new conception of sound propagation in solids and fluids and great capability in numerous novel applications.

Covers the recent themes on acoustical imaging together with time reversal acoustics, detrimental refraction and acoustical cloaking.

Acoustical Imaging: strategies and functions for Engineers is a accomplished reference on acoustical imaging and types a invaluable source for engineers, researchers, senior undergraduate and graduate students.

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33) P1: TIX/XYZ JWST175-c03 P2: ABC JWST175-Gan April 18, 2012 22 9:26 Printer Name: Yet to Come Acoustical Imaging: Techniques and Applications for Engineers where {ak (m), k = 0, . . . . , N − 1},{bl (n) , l = 0, . . . , N − 1} are one-dimensional complete orthonormal sets of basis vectors. 37) The Z-Transform The Z-transform is a generalization of the Fourier transform to the two-dimensional complex regime. 38) m,n=∞ where z1 and z2 are complex variables. The Z-transform of the impulse response of a linear shift invariant discrete system is called its transfer function.

2 Tomography The concept of acoustical tomography originated from X-ray computer-aided tomography, which is the first successful commercial application of tomography. Tomography is a form of imaging modalities which enables the viewing of the cross-sectional images of an object at various depths, and the combination of these two-dimensional images into a three-dimensional image. The analytical foundation for this method was established in 1917 [1] by Johann Radon, an Austrian mathematician concerned with gravitational theory.

The system generates images of isolated slices of the Acoustical Imaging: Techniques and Applications for Engineers, First Edition. Woon Siong Gan. © 2012 John Wiley & Sons, Ltd. Published 2012 by John Wiley & Sons, Ltd. 37 P1: TIX/XYZ JWST175-c04 38 P2: ABC JWST175-Gan April 18, 2012 9:41 Printer Name: Yet to Come Acoustical Imaging: Techniques and Applications for Engineers brain with excellent contrast even for tissues with very small differences in their ability to absorb X-rays. Tomography was introduced into ultrasonics as an eventual development.

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