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 almost about holography seemed in 1961, there was a digital explosion of analysis task within the box. greater than SOO 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 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 study task within the box is burgeoning. Tbree symposia whoUy dedicated to acoustical holography were held and tbe papers released in ebook shape. the aim of this booklet is to assemble the result of study in acoustical holography, a few of it as but unpublished, below one hide in order that staff in holography, nondestructive checking out, clinical imaging, underwater imaging, and seismic exploration can come to a decision no matter if this new strategy might be helpful to them.

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N. Leith, J. Upatnieks, B. P. Hildebrand, and K. A. Haines, Requirements for a wave front reconstruction television facsimile system, J. E. 74(10):893 (1965). 4. B. J. Thompson, A new method of measuring particIe size by diffraction techniques, Japan J. App. Phys. 4:302 (1965). 5. A. Lohmann, Optical single-sideband transmission applied to the Gabor microscope, Opt. Acta 3:97 (1956). 6. E. N. Leith and J. Upatnieks, Reconstructed wave fronts and communication theory, J. Opt. Soc. Am. 52:1123 (1962).

Upatnieks, and K. A. Haines, Microscopy by wavefront reconstruction, J. Opt. Soc. Am. 55(8):981 (1965). 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 Willow Run Laboratories, Institute of Science and Technology, The University of Michigan, Ann Arbor (1967).

The average phase is then of consequence and can gene rally be considered zero. Thus, it seems that the Rayleigh criterion is useful after all. Another useful measure one might like to have is aresolution along the radius to the object; that is, a depth resolution. This may be obtained by substituting the angular object position Eq. 55) into Eq. 84) '2 When we make the change of variable, we obtain the standard Fresnel integral shown below: mA 4Q fQ 0 exp [_. n '/'2] '2'f' where Q = mA (~)t f: 2 C(Q) = n cos( TP 2) J,/.

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