光路遮挡下的三维层析诊断精度最优化方法研究

Three-dimensional tomography has been proved to be a powerful tool in the field of combustion diagnostics, especially in the engine-related diagnostics, because of its non-invasive nature and high temporal and spatial resolution. However, due to the complex internal structure of industrial engine combustion chambers, the optical path may be partially blocked by the mechanical parts inside the chamber during the practical measurement, which influences camera measurement and degrades the tomographic reconstruction accuracy. In this paper, an improved three-dimensional tomography algorithm is proposed under the condition of optical path partially blocked. Besides, to achieve the optimal reconstruction accuracy under this condition, the camera arrangement is optimized according to the number of volume elements to be calculated and the number of observation cameras for each volume element. The effectiveness of the optimization method is validated by numerical simulation.