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Acoustical Imaging (Paperback, Softcover reprint of the original 1st ed. 1990)
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Acoustical Imaging (Paperback, Softcover reprint of the original 1st ed. 1990)
Series: Acoustical Imaging, 18
Expected to ship within 10 - 15 working days
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How to produce images with sound has intrigued engineers and
scientists for many years. Bats, whales and dolphins can easily get
good mental images with acoustical energy, but humans have little
natural ability for obtaining such images. The history of
engineering and science, however, is an impressive demonstration
that technological solutions can compensate, and then some, for
deficiencies of nature in humans. Thus with the proper technology,
we too can "see" with sound. Many methods involv ing ultrasonic
energy can be employed to enable us to do so. Few of these methods
are at all reminiscent of the acoustic systems employed by animals.
Pulse-echo, phase-amplitude and amplitude-mapping approaches
constitute the conceptual bases for three fundamentally different
types of acoustic imaging systems and can be used for categorizing
the systems. However, by now systems exist that combine the
approaches in such sophisticated ways as to make an unambiguous
categorization of some of the more complicated systems difficult or
impossible. Among the instruments so far pro duced are
mechanically-scanning focused instruments, chirped pulse-echo
instruments, and instruments involving holography, tomography,
parametric excitation, phase conju gation, neural networks, random
phase transduction, finite element methods, Doppler frequency
shifting, pseudo inversion, Bragg diffraction and reflection, and a
host of other principles. The fifty-five chapters in this volume
are selected from papers presented at the Eighteenth International
Symposium on Acoustical Imaging which was held in Santa Barbara,
California on September 18 - 20, 1989.
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