Abstract
The flow fields of supersonic free jets are visualized by the laser induced fluorescence method. The local fluorescence intensity is also detected by a computer aided high sensitive photomultiplier and 3D-stage system. The entire flow field is well observed, but the fluorescence intensity depends quantitatively on the population fraction and quenching effect of I 2 .The measured intensity is corrected in consideration of these dependences, and the corrected one is well related with the density of flow fields.
