采用结构化片光照明抑制多重散射-应用与柴油和汽油喷雾的首次评估
For dense sprays such as those encountered in diesel or gasoline direct injection, the interpretation of spray imagesis complicated by the fact that most of the light reaches the detectors after multiple scattering events within thespray. This may introduce severe errors when extracting quantitative or even qualitative information from theseimages as many diagnostics rely on the assumption of single photon scattering.It has recently been shown that the multiple scattering component of spray images can be effectively suppressed ifsets of structured light sheets are used to illuminate the spray. The aim of this report is to illustrate the potentialand the limitations of this technique for the visualization of sprays from modern diesel and gasoline injectorsat elevated atmospheric pressures. The results clearly show that conventionally recorded images are dominatedby multiple scattering, causing the light sheet to widen substantially and obscuring details within the light sheetplane. In contrast, multiple scattering and indirect reflections can be suppressed using structured light sheets andproper image processing. Careful interpretation of the corresponding images reveals details of the inner spraystructure and thus contributes to the understanding of the complicated spray break-up and atomization processes.