Acoustical Holography: Volume 5 by R. A. Smith, N. H. Doshi, R. L. Johnson, P. G. Bhuta

By R. A. Smith, N. H. Doshi, R. L. Johnson, P. G. Bhuta (auth.), Philip S. Green (eds.)

This quantity comprises the court cases of the 5th overseas Symposium on Acoustical Holograhy and Imaging, held in Palo Alto, California, on July 18-20, 1973. The identify of this Symposium differed from that of the former 4 by way of the addition of the observe "Imaging," reflecting a rise in emphasis on nonholographic tools of acoustical visualization. For comfort, no swap has been made within the identify of this released sequence. The forty two Symposium papers conceal quite a lot of theoreti­ cal and utilized themes, and successfully outline the state-of­ the-art during this swiftly constructing box. a lot of them relate to functions of acoustic visualization in such various fields as nondestructive trying out, scientific analysis, microscopy, underwater viewing, and seismic mapping. The papers offered on the Symposium have been chosen with significant the aid of this system Committee. The Editor needs to thank the next individuals for serving as contributors of this committee: P. Alais, college of Paris, France; B. A. Auld, Stanford collage; D. R. Holbrooke, kid's clinic of San Francisco; A. Korpel, Zenith Radio company; J. L. Kreuzer, Perkin Elmer company; A. F. Metherell, Actron Industries, Inc.; R. okay. Mueller, Bendix study Laboratories; B. Saltzer, u.S. Naval lower than­ sea examine and improvement heart; F. L. Thurstone, Duke college; and G. Wade, collage of California, Santa Barbara.

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R. Palermo "Simultaneous Acoustic and Optical Microscopy of Biological Specimens", Nature 239, lll (1972). 3) L. W. R. Palermo and A. Karpel "Practical High Resolution Acoustic Microscopy", pp. 51-71, Vol. 4 "Acoustic Holography" ed. by G. Wade, Plenum Press, New York (1972). 4) A. Karpel and P. Desmares "Rapid Sampling of Acoustic Holograms by Laser Scanning Techniques 11 , J. 0 pt. Soc . A mer. 4 5 , 8 81 ( 196 9). 5) A. Karpel and L. W. Kessler "Comparison of Methods of Acoustic Microscopy", pp.

Larmore, Plenum Press, New York (1970). BRAGG-DIFFRACTION IMAGING: A POTENTIAL TECHNIQUE FOR MEDICAL DIAGNOSIS AND MATERIAL INSPECTION, PART II Hormozdyar Keyani, John Landry, and Glen Wade University of California, Santa Barbara Department of Electrical Engineering and Computer Science Santa Barbara, California 93106 ABSTRACT In terms of image degradation, one of the most serious problems encountered in low-frequency Bragg-diffraction imaging is caused by multiple acoustic reflections within the Bragg cell.

KORPEL difference in the directions of the fringe shifts. That this occurs is a consequence of the fact that the direction of the simulated reference beam has changed sides with respect to the 10° insonification. One further illustrationof the simulated reference beam is shown in Fig. 5. This is an interferogram of a fruit fly larva in which N = 144, £ = l. l. and f3 = 10°. Hence, sin cp = l. 05. Heretofore, acoustic holograms have only been useful to the extent that optical reconstruction has been possible.

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