Download An Introduction to Acoustical Holography by B. P. Hildebrand PDF

By B. P. Hildebrand

Since the 1st papers by means of E. N. Leith and J. Upatnieks with regards to holography seemed in 1961, there was a digital explosion of study task within the box. greater than 500 papers and articles on holo­ graphy have seemed within the final ten years. Many purposes of holo­ graphy were proposed, and a few of those are starting 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 study job within the box is burgeoning. 3 symposia entirely dedicated to acoustical holography were held and the papers released in e-book shape. The purposeof this publication is to compile the result of learn in acoustical holography, a few of it as but unpublished, below one hide in order that staff in holography, nondestructive trying out, clinical imaging, underwater imaging, and seismic exploration can make a decision even if this new process might be priceless to them.

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Extra resources for An Introduction to Acoustical Holography

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15. E. B. Champagne, Nonparaxial imaging, magnification, and aberration properties in holography, J. Opt. Soc. Am. 57(1):51 (1967). 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 WiJlow 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.

9. 27 Holography a b Fig. 9. A Fourier transform hologram (a) and its reconstructed true image (b) are shown in these photographs. Note that the dominant structure of the hologram is now linear rather than cireular as for the Fresnel hologram. Both images should be in foeus, but due to imperfeet aeoustic lens placement this is not so. 28 Chapter 2 OBJECT OBJECT WAVE (IMAGE OF OBJECTI REFERENCE WAVE Fig. 10. The focused-image hologram is made by imaging the object into the-recording plane as shown here.

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. 4 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.

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