An Introduction to Acoustical HolographySince the first papers by E. N. Leith and J. Upatnieks on the subject of holography appeared in 1961, there has been a virtual explosion of research activity in the field. More than SOO papers and articles on holo graphy have appeared in the last ten years. Many applications of holo graphy have been proposed, and some of these are beginning to enter the realm of usefulness. One of the applications that appears to hold great promise is acoustic imaging by means of holography. The first papers on this subject appeared in 1966. but already research activity in the field is burgeoning. Tbree symposia whoUy devoted to acoustical holography have been held and tbe papers published in book form. The purpose of this book is to bring together the results of research in acoustical holography, some of it as yet unpublished, under one cover so that workers in holography, nondestructive testing, medical imaging, underwater imaging, and seismic exploration can decide whether this new technique can be useful to them. |
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a₁ a₂ aberration acoustic field acoustical hologram acoustical holography acoustical wave amplitude angle angular array astigmatism Bragg Bragg angle conjugate image consider constant cos[wt cos² detector distance distortion electronic energy equations expression film Fourier transform Gabor Hankel transform holo hologram hologram aperture illumination intensity interference pattern inverse k₁ k₂ lens light source liquid surface longitudinal waves low-pass filter magnification method object sector obtain optical oscillator particles phase phase detector photograph photographic film plane wave point source propagation pulse r₁ r₂ radiation pressure receiver scan reciprocal space reconstruction reference beam reflected resolution result sampling function sampling lattice scan hologram shear shown in Fig signal sound field source and receiver space-frequency diagram spatial frequency spectrum spherical wave technique theory tion transducer transfer function true image two-dimensional ultrasonic ultrasound velocity wave front wavelength Y₁ zero zone plate α₁ α₂ ηπ