Titlebook: Acoustical Holography; Volume 3 Proceedings A. F. Metherell Conference proceedings 1971 Plenum Press, New York 1971 Apertur.holography.imag

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Burkhard Schwenker,Stefan B?tzelent and scattered wave fields. Associated with a given spatial coordinate the scalar wave equation has two solutions. For use in holography it is essential to separate the two solutions, that is, it is of no use to solve the wave equation if the solution cannot be split into its two parts. In diffra

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,Der endgültige Abschied vom Leib?,eld of the first experimental sonar transducers, in 1918.. It was this observation that has apparently motivated the speculation on the use of ultrasonic waves as a therapeutic agent in medicine. Since there was, at that time, another kind of wave therapy, radiofrequency diathermy, already in use, w

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?Aufrechter Gang“ und Scheitern of the sound field unambiguously. However, aberrations in the image plane arise for those sound components that project out of the plane normal to the line formed by the light. Particularly it is shown that images from long objects oriented parallel to the convergence of the light beam are free fro

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?Aufrechter Gang“ und Scheiternsidered here uses a cylindrically convergent illuminating light beam. The signal-to-noise ratio for an image element (that is, a resolution cell) is shown to vary with the image-plane location when the image sensor is broadband in temporal frequency. It is also shown that quantum noise due to light

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https://doi.org/10.1007/978-3-476-03549-3 used to fabricate the model structures and of the procedures used to obtain results is presented..The results of the tests, along with a discussion of the advantages and limitations is given..The results obtained during this test program are encouraging; therefore, a discussion of the future of aco