复杂密度场测量中的莫尔层析重建技术

A New Reconstruction Algorithm for Moire Tomography in the Measurements of Complex Density Distributions

将一种新的莫尔层析重建算法应用于复杂流场测量。该算法由莫尔偏折原理和网格重建技术推导得出,直接使用光线偏折角进行修正迭代,适用于有限角采样和包含遮挡物等非完全数据条件下的层析重建。应用该算法,对火箭燃气射流场和高超音速流场的莫尔偏折图进行了处理和计算,重建出流场截面的密度分布,并对重建结果进行了分析。

A new reconstruction algorithm for Moire tomography is applied to the measurements of complex density distributions. The algorithm is derived from the basic deflection formula and based on a modified discrete element reconstructioin technique. The deflected angles are revised directly in iteraction, which is completely different from the transform methods and the existing series expansion methods. The new algorithm is used for the tomographic reconstructions of the density distributions in rocket exhausted jet and hypersonic flow,and some errors of the reconstruction result are discussed.