By R. A. Smith, N. H. Doshi, R. L. Johnson, P. G. Bhuta (auth.), Philip S. Green (eds.)
This quantity includes the lawsuits 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 through the addition of the note "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 quickly constructing box. a lot of them relate to purposes of acoustic visualization in such various fields as nondestructive trying out, scientific prognosis, microscopy, underwater viewing, and seismic mapping. The papers provided on the Symposium have been chosen with enormous the help of this system Committee. The Editor needs to thank the subsequent individuals for serving as individuals of this committee: P. Alais, college of Paris, France; B. A. Auld, Stanford college; D. R. Holbrooke, kid's medical institution of San Francisco; A. Korpel, Zenith Radio company; J. L. Kreuzer, Perkin Elmer company; A. F. Metherell, Actron Industries, Inc.; R. ok. Mueller, Bendix learn Laboratories; B. Saltzer, u.S. Naval less than sea study and improvement middle; F. L. Thurstone, Duke college; and G. Wade, collage of California, Santa Barbara.
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Additional info for Acoustical Holography: Volume 5
Thus if the surface is flat, the optical modulator will simulate a plane collimated acoustical reference impinging perpendicular to the plane. If the vibrating surface is spherical, the simulated acoustical reference is a point source located at the center of radius of the spherical surface. Qt) in Equation (3) represents the acoustical reference wave. 0 When illuminating the surface with an argon laser at 5145A, Figure 2 shows that an acoustical hologram of a sound wave, impinging at a slight angle to the perpendicular which will produce a 10% depth of modulation (peak to peak) in the acoustical hologram fringe pattern, requires a surface vibration amplitude of 15A.
A. F. 8 8 1 =82 = 0 Figure 7. Time averaged hologram-constant velocity of motion v with exposure timeT. 442A.. 7. USING TIME AVERAGED SUBFRINGE HOLOGRAPHIC INTERFEROMETRY TO RECORD AN ACOUSTICAL HOLOGRAM Since m as given by Equation (7) is recorded linearly, the subfringe holographic interferometry technique can be used to record an acoustical hologram. The propagation of a sound wave through a fluid is the propagation of a molecular strain (compression- rarefaction) wave. If the surface vibration is the acoustical strain then the surface vibration is the sound wave in the plane of the surface.
Ll, 20-22, 1967. RECENT DEVELOPMENTS WITH SCANNING LASER ACOUSTIC MICROSCOPE 23 7) A. F. Metherell, S. Spinak and E. J. Pisa 11 Temporal Reference Acoustical Holography 11 , Appl. Phys. Lett, 13' 340 (1968). 8) H. A. El-Sum 11 Progress in Acoustical Holography 11 , pp, 7-22, Vol. 2 Acoustical Holography, ed, by A. F. Metherell and L. 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.
Acoustical Holography: Volume 5 by R. A. Smith, N. H. Doshi, R. L. Johnson, P. G. Bhuta (auth.), Philip S. Green (eds.)