By Woon Siong Gan
The expertise of acoustical imaging has complex speedily over the past sixty years, and now represents a cosmopolitan process utilized to a variety of fields together with non-destructive trying out, clinical imaging, underwater imaging and SONAR, and geophysical exploration. Acoustical Imaging: strategies and functions for Engineers introduces the fundamental physics of acoustics and acoustical imaging, sooner than progressing to extra complex themes resembling 3D and 4D imaging, elasticity idea, gauge invariance estate of acoustic equation of movement and acoustic metamaterials. the writer attracts jointly different applied sciences in sonar, seismic and ultrasound imaging, highlighting the similarities among subject parts and their universal underlying theory.
- Comprehensively covers the entire vital purposes of acoustical imaging.
- Introduces the gauge invariance estate of acoustic equation of movement, with functions within the elastic constants of isotropic solids, time reversal acoustics, adverse refraction, double unfavorable acoustical metamaterial and acoustical cloaking.
- Contains modern remedies on most up-to-date theories of sound propagation in random media, together with statistical therapy and chaos theory.
- Includes a bankruptcy dedicated to new acoustics in keeping with metamaterials, a box based by means of the writer, together with a brand new concept of elasticity and new conception of sound propagation in solids and fluids and large strength in different novel applications.
Covers the new issues on acoustical imaging together with time reversal acoustics, unfavorable refraction and acoustical cloaking.
Acoustical Imaging: ideas and functions for Engineers is a complete reference on acoustical imaging and kinds a worthwhile source for engineers, researchers, senior undergraduate and graduate students.
Chapter 1 creation (pages 1–4):
Chapter 2 Physics of Acoustics and Acoustical Imaging (pages 5–14):
Chapter three sign Processing (pages 15–36):
Chapter four universal Methodologies of Acoustical Imaging (pages 37–61):
Chapter five Time?Reversal Acoustics and Superresolution (pages 63–87):
Chapter 6 Nonlinear Acoustical Imaging (pages 89–123):
Chapter 7 High?Frequencies Acoustical Imaging (pages 125–139):
Chapter eight Statistical remedy of Acoustical Imaging (pages 141–168):
Chapter nine Nondestructive checking out (pages 169–194):
Chapter 10 scientific Ultrasound Imaging (pages 195–262):
Chapter eleven Underwater Acoustical Imaging (pages 263–287):
Chapter 12 Geophysical Exploration (pages 289–324):
Chapter thirteen Quantum Acoustical Imaging (pages 325–341):
Chapter 14 destructive Refraction, Acoustical Metamaterials and Acoustical Cloaking (pages 343–368):
Chapter 15 New Acoustics according to Metamaterials (pages 369–406):
Chapter sixteen destiny instructions and destiny applied sciences (pages 407–408):
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Additional info for Acoustical Imaging: Techniques and Applications for Engineers
49) where ξxs = 1 1 , ξyx = , ξxs > 2ξx0 , ξys > 2ξy0 y y This theorem states that if the random ﬁeld f (x, y) is sampled above its Nyquist rate, then a continuous random ﬁeld f¯(x, y) can be reconstructed from the sampled sequences such that f¯(x, y) converges to f in the mean-square sense. 7 Practical Limitation in Sampling and Reconstruction The above sampling theory is based on several idealizations. Real-world images are not band-limited, which means that aliasing errors can occur. These can be reduced by ﬁltering the input image prior to sampling, but at the cost of attenuating higher spatial frequencies.
In the dual-reciprocity BEM – although there is no need to discretize the volume into meshes – unknowns at chosen points inside the solution domain are involved in the linear algebraic equations approximating the problem being considered. The Green’s function elements connecting pairs of source and ﬁeld patches deﬁned by the mesh form a matrix, which is solved numerically. Unless the Green’s function is well behaved (at least for pairs of patches near each other), the Green’s function must be integrated over either or both the source patch and the ﬁeld patch.
High-frequency, focused beam, multielement imaging search sonars and acoustic cameras often require ﬁfth-order spatial processing. Many sonar systems, such as on torpedoes, consist of arrays of possibly 100 elements that must accomplish beamsteering over a 100-degree ﬁeld of view and work in both active and passive modes. Sonar arrays are used both actively and passively in one, two and three dimensions: r One-dimensional line arrays are usually in multielement passive systems towed behind ships and in a single or multielement side-scan sonar.