Angular spectrum method: Difference between revisions

Revision as of 23:49, 9 November 2006

Revision as of 09:37, 22 December 2006

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The '''angular spectrum method''' is a technique for modeling the propagation of acoustic fields. Its mathematical origins lie in the field of [[Fourier Optics]]<ref>''Digital Picture Processing'', 2nd edition 1982, Azriel Rosenfeld, Avinash C. Kak, ISBN 01259730200-12-597302-0, Academic Press, Inc.</ref><ref>''Linear Systems, Fourier Transforms, and Optics'' (Wiley Series in Pure and Applied Optics) Jack D. Gaskill </ref><ref>''Introduction to Fourier Optics'', Joseph W. Goodman.</ref> but it has been applied extensively in the field of [[ultrasound]]. The technique can predict an acoustic pressure field distribution over a plane, based upon knowledge of the pressure field distribution at a parallel plane. Predictions in both the forward and backward propagation directions are possible.

Modeling the diffraction of a CW (continuous wave), monochromatic (single frequency) field involves the following steps: