New PDF release: Acoustical Holography: Volume 5

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

ISBN-10: 1475708270

ISBN-13: 9781475708271

ISBN-10: 1475708297

ISBN-13: 9781475708295

This quantity includes the court cases of the 5th overseas Symposium on Acoustical Holograhy and Imaging, held in Palo Alto, California, on July 18-20, 1973. The name of this Symposium differed from that of the former 4 by means of the addition of the observe "Imaging," reflecting a rise in emphasis on nonholographic equipment of acoustical visualization. For comfort, no switch has been made within the identify of this released sequence. The forty two Symposium papers conceal quite a lot of theoreti­ cal and utilized subject matters, and successfully outline the state-of­ the-art during this quickly constructing box. lots of them relate to purposes of acoustic visualization in such different fields as nondestructive trying out, scientific analysis, microscopy, underwater viewing, and seismic mapping. The papers offered on the Symposium have been chosen with massive the help of this system Committee. The Editor needs to thank the next individuals for serving as participants of this committee: P. Alais, collage of Paris, France; B. A. Auld, Stanford collage; D. R. Holbrooke, kid's health facility 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 examine and improvement middle; F. L. Thurstone, Duke collage; and G. Wade, college of California, Santa Barbara.

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Holographic interferometry in its basic form when used 41 42 A. F. METHERELL on vibrating objects is insensitive to the phase of the vibrations but is sensitive to the absolute amplitude of vibrations. The purpose of this paper is to describe a modified form of holographic interferometry using a phase modulated reference or object beam which is sensitive to much smaller (subfringe) changes and motions, is sensitive to both phase and amplitude of motion, and where image intensity is linearly related to phase and amplitude.

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.

The basic concept described here was first presented at the Second International Symposium on Acoustical Holography and published in the proceedings. The theory was later expanded and presented at the Annual Meeting of the Optical Society of America in October 1969. This paper presents the theoretical analysis of linearized subfringe interferometric holography and some experimental results. The theory is expanded to show how this can be used to record acoustical holograms. l. INTRODUCTION Holographic interferometry1- 6 has proven to be a useful and sensitive tool for measuring the motion of objects and changes in the refractive index of fluids.

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Acoustical Holography: Volume 5 by R. A. Smith, N. H. Doshi, R. L. Johnson, P. G. Bhuta (auth.), Philip S. Green (eds.)


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