Electronic Reconstruction of Acoustic Holograms

Skattebol L.V. (1970) Electronic Reconstruction of Acoustic Holograms. IEEE Transactions on Audio and Electroacoustics, 18 1: 59-62. doi:10.1109/TAU.1970.1162072

Author Skattebol L.V.
Title Electronic Reconstruction of Acoustic Holograms
Journal name IEEE Transactions on Audio and Electroacoustics
ISSN 0018-9278
Publication date 1970
Sub-type Article (original research)
DOI 10.1109/TAU.1970.1162072
Volume 18
Issue 1
Start page 59
End page 62
Total pages 4
Subject 1711 Signal Processing
2208 Electrical and Electronic Engineering
2200 Engineering
Abstract A method is described for reconstructing acoustic hologram images using an electronic means which avoids multiple image formation. When the dimensions of the hologram are small compared to the dimensions of the viewing area, the incident waves are approximately plane rather than spherical. In this case the wavefront pattern can be resolved into components along two orthogonal directions, e.g., the x and y axes. Thus the information can be received by an array of transducers along only the two axes, instead of over the entire hologram surface as is customary. A disadvantage which occurs with reconstruction from plane waves is an ambiguity between right and left, resulting in the formation of multiple images. This effect may be avoided if the usual method of forming a diffraction pattern at the hologram surface by adding a reference wave is not carried out. Instead, the information is received and processed at the sound frequency f0. Spatial sine (VS) and cosine (Vc) transforms are carried out first, and then demodulated. The essence of the unambiguous decoding method is to demodulate V, and Vc by both in-phase and quadrature demodulation, forming four quantities which can be combined to give the required intensity. The combination of the four quantities is performed such as to effectively phase out the information from all directions except one and this avoids the formation of multiple images. The procedure is to be applied to both x and y axis information and the results multiplied to give a single reconstructed image. Copyright
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
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