Effect of Imaging Blurring on 3D Computed Tomography of Chemiluminescence

Abstract

Chemiluminescence measurements are commonly employed in the study of flame geometry and excited species concentrations. Computed tomography of chemiluminescence (CTC) is potential for the three-dimensional diagnostics of combustion both on high spatial and temporal resolution. It uses 2D multidirectional projections as inputs incorporated with iterative algorithms to get the 3D distribution. In general, a good simulation of projection processing by charge-coupled device (CCD) is important for the reconstruction solution. Bokeh effect out of focus may have an effect on the projections, which is produced by lenses of finite aperture. In order to verify the influence of imaging blurring on 3D-CTC, three different projection models were studied, including clear-imaging model, out-of-focus imaging model, and deconvolution model. The results suggest that the model taken the consideration of Bokeh effects has the best reconstruction accuracy, but it is time consuming. The projection deconvolution processing can improve reconstruction accuracy without increasing computation time.