Development of Digital Speckle Tomography for Analysis of Unsteady and Asymmetric Flows

Koji Okamoto; Yong Jae Kim; Han Seo  Ko

doi:10.4028/www.scientific.net/SSP.120.267

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HomeSolid State PhenomenaSolid State Phenomena Vol. 120Development of Digital Speckle Tomography for...

Development of Digital Speckle Tomography for Analysis of Unsteady and Asymmetric Flows

Abstract:

A four-dimensional digital speckle tomography has been developed to analyze an initial helium jet flow. Speckle movements from refraction of a laser beam have been captured by multiple high-speed cameras simultaneously because a shape of a nozzle for the jet flow is asymmetric and the initial jet flow is fast and unsteady. A cross-correlation tracking method has been used to obtain the speckle displacements between no flow and helium jet flow from an asymmetric nozzle controlled by a solenoid valve. The measured speckle movements have been transferred to deflection angles of laser rays to calculate density gradients. The four-dimensional density fields for the high-speed and initial helium jet flow have been reconstructed from the deflection angles by a developed real-time tomography method.

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Periodical:

Solid State Phenomena (Volume 120)

Pages:

267-272

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.120.267

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Online since:

February 2007

Authors:

Koji Okamoto, Yong Jae Kim, Han Seo Ko

Keywords:

Cross-Correlation, Digital Speckle Tomography, Initial Helium Flow, Multiplicative Algebraic Reconstruction Technique (MART)

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References

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