Mathias Fink (auth.), Prof. Joie Pierce Jones (eds.)'s Acoustical Imaging PDF

By Mathias Fink (auth.), Prof. Joie Pierce Jones (eds.)

ISBN-10: 1461357977

ISBN-13: 9781461357971

ISBN-10: 1461519438

ISBN-13: 9781461519430

This quantity represents the complaints of the 21 st overseas Symposium on Acoustical Imaging, which used to be held on the Surf and Sand inn in Laguna seashore, California, March 28-30, 1994. those designated and hugely interdisciplinary sequence of symposiums have met at durations of approximately 18 months over the last 30 a few years. more often than not those conferences are dedicated to all features and all fields of imaging that use acoustics. The conferences are typically small, with a hundred to 2 hundred individuals, and stimulate worthy interchanges throughout disciplines. those are the one standard conferences the place the main researchers in all components of acoustical imaging can come jointly to switch rules and new suggestions. The Acoustical Imaging Symposiums have lengthy been considered as the foremost assembly of this sort within the common box of acoustics. The very popular and thoroughly edited lawsuits were released on a regular basis through Plenum Press. i'm proud and commemorated to function editor of the twenty first quantity during this sequence. The twenty first Symposium was once attended via good over a hundred individuals from a few 18 nations. throughout the 3 day symposium, ninety four medical shows got, sixty six as formal lectures and 28 in a poster structure. adequate time used to be on hand through the convention, either following the displays and informally in the course of nutrition and breaks, for lively discussions between all members. Over eighty of the shows were chosen for inclusion in those proceedings.

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Contr. 39, 567-578 (1992). 3. D. Cassereau and M. Fink, "Time-reversal of ultrasonic fields - Part III: Theory of the closed time-reversal cavity", IEEE Trans. Ultrason. Ferroelec. Freq. Contr. 39, 579-592 (1992). 4. D. Cassereau and M. Fink, "Focusing with plane time-reversal mirrors: an efficient alternative to closed cavities", J. Acoust. Soc. Am. 94, 2373-2386 (1993). 5. P. M. Morse and K. U. Ingard, Theoretical acoustics, New York, McGraw Hill (1968). 6. L. M. Brekhovskikh, Waves in layered media, New York, Academic Press (1960).

That of water). Acoustical Imaging, Vol. P. Jones, Plenum Press, New York, 1995 31 Field lane ~(x,y,z) Source plane Figure 1. Geometry of source and receiving plane. REVIEW OF PROPAGATION SIMULATION TECHNIQUE The propagation simulation technique [10, 11] is based on linear systems theory. We assume that the medium is lossless, linear, and homogeneous and that the source is surrounded by a rigid baffle. The first set of assumptions assures that propagation is a linear operation. The velocity of the source is assumed to be separable in space and time and is given by v(xo,yo,O,t) = s(x,y)T(t).

5 mm at -6 dB): this is due to the fact that we now try to focuse on a target that is not located on the symmetry axis of the emitter, and this is not an optimal configuration. Nevertheless, this result proves that the TRP is efficient enough to be able to focnse, even in inadequate situations. The field obtained using the FSP shows a similar mainlobe and a higher sidelobes level. We also observe that the focal pattern is not symmetric, and that the asymmetry effect is enhanced in the case of the FSP.

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Acoustical Imaging by Mathias Fink (auth.), Prof. Joie Pierce Jones (eds.)

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