Woon Siong Gan Livres

Focusing on time reversal acoustics, this book delves into its theoretical foundations across the first eleven chapters, exploring its symmetry properties. Subsequent chapters detail four major applications: underwater communication, seismic exploration, nondestructive evaluation, and medical ultrasound imaging, complete with experimental setups and case studies. The author introduces a gauge invariance approach, confirmed through the development of acoustical metamaterials and superresolution applications. Notably, it highlights innovative uses of time reversal acoustics in underwater communication technology.

Focusing on the symmetry properties of acoustic fields, this book explores the gauge invariance approach to uncover these characteristics. It emphasizes the importance of symmetry as a theoretical framework for metamaterials, showcasing its application in the successful fabrication of acoustical metamaterials.

Focusing on the innovative field of quantum acoustical imaging, the book delves into its theoretical foundations and practical applications. It explores advanced techniques like terahertz ultrasound and SASER technology, showcasing the author's inventions such as phonons entanglement systems and quantum ultrasound diffraction tomography. The text emphasizes the advantages of surpassing classical imaging limits and includes discussions on quantum microphones and transducers, culminating in a chapter on quantum image processing.

Focusing on the innovative potential of acoustical metamaterials, the book explores how they can control sound propagation through mechanisms like scattering, diffraction, and refraction. It introduces the concept of "new acoustics," emphasizing the role of symmetry in acoustic fields as a theoretical foundation. The narrative traces the evolution of these materials from locally resonant sonic structures to the introduction of negative acoustic parameters, illustrating their compliance with the acoustic equation of motion and highlighting the symmetry properties inherent in acoustic phenomena.

The book presents a comprehensive exploration of nonlinear acoustics, beginning with its theoretical foundations, including essential equations and a statistical mechanics perspective. It advances into curvilinear spacetime and gauge invariance approaches, as well as the application of chaos theory. Additionally, various nonlinear acoustical imaging techniques are discussed, such as B/A nonlinear parameter imaging, fractal imaging, and harmonics imaging, along with their practical applications, offering a multifaceted view of the field.

This book discusses the applications of signal and image processing in acoustical imaging. It first describes the basic tools involved – the 2D transform, fast Fourier transform (FFT) and applications, and deconvolution – before introducing readers to higher-order statistics, wavelets, and neural networks. It also addresses the important topic of digital signal processing, focusing on the example of homomorphic signal processing. The book then details the design of digital filters and array signal processing, and lastly examines applications in image processing: image enhancement and optimization, image restoration, and image compression.