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 500 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. Three symposia wholly devoted to acoustical holography have been held and the papers published in book form. The purposeof this book is to bring together the results of research in acoustical holography, some of it as yet unpublished, under one cover so that workers in holography, nondestructive testing, medical imaging, underwater imaging, and seismic exploration can decide whether this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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₁(vt a₁ a₁²(vt aberration acoustical holography acoustical wave amplitude angle angular array astigmatism binomial series Chapter conjugate image consider constant cos[wt cos² detector diffraction distance distortion electronic energy equations expression film Fourier transform Fresnel zone FRESNEL ZONE PLATE Gabor holo hologram hologram aperture illumination image location intensity interference pattern k₂ lattice lens liquid surface longitudinal wave low-pass filter magnification method normal object point obtain optical oscillator paraxial approximation phase phase detector phase term photograph plane wave propagation pulse r₁ r₂ radiation pressure Rayleigh receiver scan reciprocal space reconstruction RECORDING PLANE reference beam resolution result s₁(x sampling function scan hologram shown in Fig signal sin² sound source and receiver source scan spatial frequency spectrum spherical wave term tion transducer true image ultrasonic vector velocity wave front wavelength Y₁ zero α₁ α₂ αι ηπ