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An interferometric CT technique is applied to observe a 3-D flow field induced by shock waves. A small duct model with a pair of circular ducts is introduced in the test section of shock tube. In our previous study, 3-D density distribution is reconstructed from projection data by FBP (Filtered Back Projection) method. To improve the precision of reconstructed image, MLEM (Maximum Likelihood Estimation Maximum) and ART algorithm are newly applied to our 3-D interferometric CT measurement of unsteady density field. The noise in the reconstructed image is reduced by MLEM and ART algorithm.

Three-Dimensional Laser-Interferometric CT Measurement of High-Speed and Unsteady Flow Field Discharged from Open End