Titlebook: Acoustical Imaging; Yu Wei,Benli Gu Book 1993 Springer Science+Business Media New York 1993 Transducer.diffraction.geophysics.imaging.micr

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Aufgaben einer Akademie — heuteabrupt changes, e. g., of ultrasonic reflected pulse signal the usages of signal processing methods of pure time or frequency domain are limited because of the singularity of these kinds of signals. In this paper, Wavelet Transform (WT) , a time-frequency domain analysis method, is employed as a bas

Gingivitis

Aufgaben einer Akademie — heutes a significant increase in the signal to noise ratio (SNR) of the echogram.. In correlation based systems, instead of a single periodic excitation function, a coded sequence is applied to the transducer, and the returning signals, corrupted by noise, are then correlated with a delayed replica of th

JOT

Aufgaben für physikalische Schülerübungenomography techniques have been developed rapidly in a number of new areas,such as nondestructive evaluation , geophysical tomography and seismic tomography. However,the situation often arises in these areas where the number of views,the angular coverage and the number of samples within a view are se

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Debility

,Aufgaben über Reibungselektrizität,s on imaging are discussed when the imaged object moves in the direction parallel to or perpendicular to the scanning direction. The discussion of the motion compensation is also given in the paper. The computer simulations are made to verify the theoretical analyses.

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Mets552

https://doi.org/10.1007/978-3-663-09308-4erved scattered acoustic field outside of the object, is discussed in this paper. Because the wave length of the incident wave is on the order of 1mm, diffraction effects of the insonifying wave must be taken into account. Conventionally, the first-order Born and Rytov approximation inversion algori

Conducive

Funktionen von mehreren Variablen,. But up to now, it is still very difficult to reconstruct a higher dimensional scatterer from the observed scattered field outside the scatterer. The difficulties in reconstructing a higher dimensional scatterer lie in diffraction effects. What is the way out? One notes that the one dimensional inv

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