An Introduction to Acoustical Holography by B. P. Hildebrand

By B. P. Hildebrand

Since the 1st papers through E. N. Leith and J. Upatnieks with reference to holography seemed in 1961, there was a digital explosion of analysis job within the box. greater than SOO papers and articles on holo­ graphy have seemed within the final ten years. Many functions of holo­ graphy were proposed, and a few of those are commencing to input the world of usefulness. one of many purposes that looks to carry nice promise is acoustic imaging through holography. the 1st papers in this topic seemed in 1966. yet already learn task within the box is burgeoning. Tbree symposia whoUy dedicated to acoustical holography were held and tbe papers released in publication shape. the aim of this e-book is to assemble the result of learn in acoustical holography, a few of it as but unpublished, less than one conceal in order that employees in holography, nondestructive trying out, clinical imaging, underwater imaging, and seismic exploration can come to a decision no matter if this new process could be worthwhile to them.

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Extra resources for An Introduction to Acoustical Holography

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78) The Rayleigh resolution eriterion states that two points in objeet spaee are 43 Holography resolved if the point of maximum intensity of one image falls on the point of zero intensity of the seeond image. 79) mA If we wish to find the objeet point motion required to move the image by Xl' with the result that ß b , we solve Eq. 80) If we had used a eireular aperture, Eq. 22. Normally, holograms are reetangular, mainly beeause that seems to be the shape in which photographie film is made. These expressions are not the most desirable in that the resolution is defined in a plane parallel to the x-y plane.

16. R. W. Meier, Magnification and third-order aberrations in holography, J. Opt. Soc. Am. 55(8):987 (1965). 17. K. A. Haines, The analysis and application of hologram interferometry, Report No. 7421-25-T of the Willow Run Laboratories, Institute of Science and Technology, The University of Michigan, Ann Arbor (1967). 18. M. Born and E. , New York, p. 166 (1964). 19. J. W. Goodman, Introduction to Fourier Optics, McGraw-Hill, New York, Chapter 6 (1968). 20. M. Born and E. , New York, p. 441 (1964).

21. B. P. Hildebrand and K. A. Haines, Holography by scanning, J. Opt. Soc. Am. 59(1):1 (1969). 1. INTRODUCTION The term acoustics covers a broad range of subjects, many of which need not be considered in this book. Among those subjects not covered are architectural acoustics, communication acoustics, noise and vibration analysis, music, techniques for measuring elastic constants of solid materials, techniques for studying nonisotropic stresses and inhomogeneities, and measurements of molecular structure of organic liquids.

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