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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 includes the complaints of the 5th foreign 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 via the addition of the be aware "Imaging," reflecting a rise in emphasis on nonholographic tools of acoustical visualization. For comfort, no switch has been made within the identify of this released sequence. The forty two Symposium papers conceal a variety of theoreti­ cal and utilized subject matters, and successfully outline the state-of­ the-art during this speedily constructing box. a lot of them relate to purposes of acoustic visualization in such assorted fields as nondestructive trying out, scientific prognosis, microscopy, underwater viewing, and seismic mapping. The papers offered on the Symposium have been chosen with enormous the aid of this system Committee. The Editor needs to thank the subsequent people for serving as participants of this committee: P. Alais, college of Paris, France; B. A. Auld, Stanford college; D. R. Holbrooke, kid's sanatorium 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 less than­ sea learn and improvement middle; F. L. Thurstone, Duke college; and G. Wade, collage of California, Santa Barbara.

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KESSLER, P. R. PALERMO, AND A. KORPEL a b c Fig. 2. Images of a section of a fruit fly larva a) in-focus acoustic hologram (interferogram) with an electronically simulated normal incidence reference beam, b) acoustic image of same, c) corresponding optical image. RECENT DEVELOPMENTS WITH SCANNING LASER ACOUSTIC MICROSCOPE 19 For a homogeneous sample, the spacing between the fringes is dependent upon the angle between the object and the simulated reference beam. Localized variations in the velocity of sound cause lateral shifts of the fringes which may be measured to quantify the velocity change.

In order to keep down the cost of fabrication, a basically simple design of a cemented doublet lens was made. In such a design, there is less flexibility than with other designs since the two inside surfaces must have identical radii of curvature but a lens system of this type has the advantage of being less critical to mount and also less sensitive to mechanical shock than other systems. In order to find an optimum design for a cemented doublet, a ray-trace program was implemented for the configuration shown in Figure 10.

The generation of a simulated off-axis reference signal, electronically, is not a new concept; see for example references 6, 7, 8. The method employed here is shown in Fig. 3; details of the sample cell, laser scanning method FREQUENCY MULTI Pll ER XN TV SYNC SOURCE ( HOR IZONTALJ 1 VERT I CAL 1 0 TV ACOUSTIC TRANSDUCER Fig. 3. Experimental setup for electronically simulating an off-axis acoustic reference beam. 20 L. W. KESSLER, P. R. PALERMO, AND A. KORPEL and optical detection methods were described in ref.

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