Moiré层析迭代算法改进

Improvement of algebraic reconstruction technique for moiré tomography

应用自开发的Moiré层析算法重建轴对称流场,以检验层析算法的有效性。根据Moiré偏折的光学原理,以及层析的数学、物理意义,研究开发了Moiré偏折层析程序。采用基本代数迭代算法(Algebraic Reconstruction Technique:ART)及自研发的简单自相关代数迭代重建算法(Simple Self-correlative Algebraic Reconstruction Technique:SSART),应用Moiré偏折层析程序模拟重建了轴对称流场。结果发现,本工作开发的Moiré层析程序,采用SSART迭代算法能够较精确地重建正、负向轴对称流场,较采用ART迭代技术有较大的改进。

Moiré tornngrophy programmed by ourselves was applied to reconstructing axis- symmetry fields in order to test the program＇s validity. Moire deflection tomography was programmed based on optical principle of Moire deflection and mathematical, physical significance of tomography. The program was used to simulate reconstructing axis- symmetry fields with Algebraic Reconstruction Technique （ART） and with Simple Self- correlative Algebraic Reconstruction Technique {SSART）, which was programmed by ourselves. As a result, the Molté tomogeaphy program could recoastruct the positive and negative axis - symmetry fields accurately with SSART. The reconstructed fields with SSART improved much than that reconstructed with ART.