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Threefold Seismic or Acoustic Holographic Interferograms for Improved Reconstructed-image Definition and Contrast.

Authors
Fitzpatrick-GL; Yoder-LP
Source
Acoust Imaging and Hologr 1(1):71-110
Link
NIOSHTIC No.
10009773
Abstract
Threefold seismic or acoustical holographic interferograms may be used to enhance a particular phase contour characterizing very subtle changes in the shape, position, or acoustical properties of objects of geophysical interest. The hologram may be either a reflection or transmission hologram, and objects may be reflectors, phase objects or combinations of these. In every case, by choosing the proper weights for the three holograms and the proper reference phase angles, any particular phase contour characterizing subtle changes in the objects or their positions can be made to exhibit relative reconstructed image-background contrasts of unity. The technique is particularly applicable to the problem of delineating objects of geophysical interest. It is shown that the technique may be used even when objects do not change. Theoretical ideas are supported by appeal to computer models, laboratory model data, and seismic field data. Other applications, such as imaging body tissue, are suggested.
Publication Date
19780101
Document Type
OP;
Fiscal Year
1978
NTIS Accession No.
NTIS Price
Identifying No.
OP 59-78
Issue of Publication
1
Source Name
Acoust. Imaging and Hologr., V. 1, No. 1, PP. 71-110
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