New PDF release: An Introduction to Acoustical Holography

By B. P. Hildebrand

ISBN-10: 1461586577

ISBN-13: 9781461586579

ISBN-10: 1461586593

ISBN-13: 9781461586593

Since the 1st papers by way of E. N. Leith and J. Upatnieks with reference to holography seemed in 1961, there was a digital explosion of study 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 functions that looks to carry nice promise is acoustic imaging by way of holography. the 1st papers in this topic seemed in 1966. yet already examine job within the box is burgeoning. Tbree symposia whoUy dedicated to acoustical holography were held and tbe papers released in e-book shape. the aim of this publication is to collect the result of study in acoustical holography, a few of it as but unpublished, lower than one disguise in order that staff in holography, nondestructive checking out, scientific imaging, underwater imaging, and seismic exploration can make a decision no matter if this new strategy may be precious to them.

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Note that the dominant structure of the hologram is now linear rather than circular as for the Fresnel hologram. Both images should be in focus, but due to imperfect acoustic lens placement this is not so. Chapter 2 28 OBJECT OBJECT WAVf. IMAGE OF OBJECTI <112 ~:P: REFERENCE WAVE Fig. 10. The focused-image hologram is made by imaging the object into the recording plane as shown here. 5. Focused-Image Holograms This is one classification of holography that has not been discussed in detail. Adefinition of this class of hologram might be the interference pattern between two noncollinear beams of radiation recorded in the near zone of the object.

In this figure all parameters are the same as in Fig. 5. Now, however, a coherent electronic reference is used. Note that the image (b) is now as good as that obtained in Fig. 5 even though no background wave is present. 22 Chapter 2 It is interesting to note that for long wavelength radiation aGabor hologram can be generated with a constant amplitude plane wave component without the aforementioned restriction, as shown by Eq. 15). A hologram of this type, and its reconstruction is shown in Fig.

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.

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An Introduction to Acoustical Holography by B. P. Hildebrand

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