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Proceedings Paper

Development of novel integration method of digital speckle tomography for analysis of unsteady and asymmetric flows
Author(s): Han Seo Ko; Yong-Jae Kim; Seung Hwan Baek
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Paper Abstract

Transient and asymmetric density distributions have been investigated by a digital speckle tomography with a novel integration method. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and unsteady. The speckle movements which have been formed by a ground glass between no flow and downward butane flow from an elliptical nozzle have been calculated by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays for density gradients. A novel integration method has been developed to obtain projection data from the deflection angles for the speckle tomography. The unsteady density fields have been reconstructed from the accurate projection values by a real-time multiplicative algebraic reconstruction technique (MART) with the developed integration method.

Paper Details

Date Published: 15 September 2006
PDF: 6 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63411A (15 September 2006); doi: 10.1117/12.695361
Show Author Affiliations
Han Seo Ko, Sungkyunkwan Univ. (South Korea)
Yong-Jae Kim, Sungkyunkwan Univ. (South Korea)
Seung Hwan Baek, Sungkyunkwan Univ. (South Korea)

Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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