15 September 2006 Development of novel integration method of digital speckle tomography for analysis of unsteady and asymmetric flows
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Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63411A (2006) https://doi.org/10.1117/12.695361
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France
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.
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Han Seo Ko, Yong-Jae Kim, Seung Hwan Baek, "Development of novel integration method of digital speckle tomography for analysis of unsteady and asymmetric flows", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63411A (15 September 2006); doi: 10.1117/12.695361; https://doi.org/10.1117/12.695361
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