By Woon Siong Gan
''Acoustical Imaging starts off with an advent to the fundamental theories and rules of acoustics and acoustical imaging, then progresses to debate its diverse purposes: nondestructive trying out, clinical imaging, underwater imaging and SONAR and geophysical exploration. the writer attracts jointly the several applied sciences, highlighting the similarities among subject parts and their universal underlying thought. Some complex issues also are defined akin to nonlinear acoustical imaging and its software in nondestructive checking out, software of chaos thought to acoustical imaging, statistical therapy of acoustical imaging and unfavorable refraction''--Provided through publisher.
''Introduces the fundamental theories and rules of acoustics and acoustical imaging''--Provided via publisher. Read more...
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Extra resources for Acoustical imaging : techniques and applications for engineers
This will shift beamforming design efforts signiﬁcantly between the system’s upstream components (transducers, preamps and digitizers) and the actual downstream beamformer computational hardware. 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.
The extension of the DFT and unitary DFT of a sequence and their inverse transforms are periodic with period N. 10), v(k) = v(k + N) for every k. The DFT is the sampled spectrum of the ﬁnite sequence u(n) extended by zeros outside the interval [0, N − 1]. 8) would be u( ˜ 2πk )/ N. 15) The Fast Fourier Transform The fast Fourier transform (FFT) was invented by Cooley and Tukey in 1965 . Its purpose was to reduce the computation time of the DFT and the unitary DFT. It is a class of algorithms that requires O(N log2 N) operations, where one operation is a real multiplication and a real addition.
The ﬁrst practical tomographic reconstructions were done 40 years later by Ronald Bracewell , a radio astronomer. Radon’s theorem proved that any two-dimensional object can be reconstructed uniquely from an inﬁnite set of its projections. This result has been independently rediscovered a number of times since then by other mathematicians, radio astronomers, electron microscopists, workers in optics, and medical radiologists. The ﬁrst practical, clinically orientated solutions to reconstructive tomography appeared in the early 1960s after Alan Cormack  of Tufts University began to popularize and extend Radon’s work.
Acoustical imaging : techniques and applications for engineers by Woon Siong Gan