@inproceedings{2c769e676df148feb7641db570351614,
title = "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.",
keywords = "Cross-correlation, Digital speckle tomography, Initial helium flow, Multiplicative Algebraic Reconstruction Technique (MART)",
author = "Koji Okamoto and Kim, \{Yong Jae\} and Ko, \{Han Seo\}",
year = "2007",
doi = "10.4028/3-908451-29-9.267",
language = "English",
isbn = "3908451299",
series = "Solid State Phenomena",
publisher = "Trans Tech Publications Ltd",
pages = "267--272",
booktitle = "Safety and Structural Integrity 2006",
note = "International Symposium on Safety and Structural Integrity 2006 ; Conference date: 08-12-2005 Through 10-12-2005",
}