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An extended algebraic reconstruction technique (ART) for density-gradient projections: laser speckle photographic tomography.

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Názov: An extended algebraic reconstruction technique (ART) for density-gradient projections: laser speckle photographic tomography.
Autori: Ko*, H.S., Kihm, K.D.
Zdroj: Experiments in Fluids; Nov1999, Vol. 27 Issue 6, p542-550, 9p
Abstrakt: An extended algebraic reconstruction technique (ART) is presented for tomographic image reconstruction from the density-gradient projections, such as laser speckle photography. The essence of the extended ART is that the density-gradient projection data of speckle photography (Eq. (1)) are first numerically integrated to the algebraic representation of interferometric fringe number data (Eq. (12)), which ART can readily reconstruct into the cross-sectional field. The extended ART is numerically examined by using two computer synthesized phantom fields, and experimentally by using asymmetric single and double helium jets in air. The experimentally reconstructed images were also compared with the direct measurements of helium concentration using an oxygen analyzing probe. The extended ART method shows an improved accuracy and is proposed to use to tomographically reconstruct the density-gradient projections over the previous Fourier convolution (FC) method (Liu et al. 1989). [ABSTRACT FROM AUTHOR]
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  Data: An extended algebraic reconstruction technique (ART) for density-gradient projections: laser speckle photographic tomography.
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  Data: <searchLink fieldCode="AR" term="%22Ko*%2C+H%2ES%2E%22">Ko*, H.S.</searchLink><br /><searchLink fieldCode="AR" term="%22Kihm%2C+K%2ED%2E%22">Kihm, K.D.</searchLink>
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  Data: Experiments in Fluids; Nov1999, Vol. 27 Issue 6, p542-550, 9p
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: An extended algebraic reconstruction technique (ART) is presented for tomographic image reconstruction from the density-gradient projections, such as laser speckle photography. The essence of the extended ART is that the density-gradient projection data of speckle photography (Eq. (1)) are first numerically integrated to the algebraic representation of interferometric fringe number data (Eq. (12)), which ART can readily reconstruct into the cross-sectional field. The extended ART is numerically examined by using two computer synthesized phantom fields, and experimentally by using asymmetric single and double helium jets in air. The experimentally reconstructed images were also compared with the direct measurements of helium concentration using an oxygen analyzing probe. The extended ART method shows an improved accuracy and is proposed to use to tomographically reconstruct the density-gradient projections over the previous Fourier convolution (FC) method (Liu et al. 1989). [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Experiments in Fluids is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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