Cai Weiwei, Li Xuesong, Ma Lin
Appl Opt. 2013 Nov 20;52(33):8106-16. doi: 10.1364/AO.52.008106.
Instantaneous three-dimensional (3D) measurements have been long desired to resolve the spatial structures of turbulent flows and flame. Previous efforts have demonstrated tomography as a promising technique to enable such measurements. To facilitate the practical application, this work investigated four practical aspects for implementing 3D tomographic under the context of volumetric combustion diagnostics. Both numerical simulations and controlled experiments were performed to study: (1) the termination criteria of the inversion algorithm; (2) the effects of regularization and the determination of the optimal regularization factor; (3) the effects of a number of views; and (4) the impact of the resolution of the projection measurements. The results obtained have illustrated the effects of these practical aspects on the accuracy and spatial resolution of volumetric tomography. Furthermore, all these aspects are related to the complexity and implementing cost (both hardware cost and computational cost). Therefore, the results obtained in this work are expected to be valuable for the design and implementation of practical 3D diagnostics.
长期以来，人们一直希望能够进行瞬时三维（3D）测量，以解析湍流和火焰的空间结构。此前的研究表明，层析成像技术是实现此类测量的一种很有前景的技术。为了便于实际应用，本文在体积燃烧诊断的背景下，对实施三维层析成像的四个实际方面进行了研究。通过数值模拟和控制实验来研究：（1）反演算法的终止准则；（2）正则化的影响及最优正则化因子的确定；（3）视图数量的影响；（4）投影测量分辨率的影响。所获得的结果表明了这些实际方面对体积层析成像的精度和空间分辨率的影响。此外，所有这些方面都与复杂性和实施成本（包括硬件成本和计算成本）相关。因此，本文所获得的结果有望对实际三维诊断的设计和实施具有重要价值。
