Summary
To elucidate the dynamics of heat and fluid flows, three-dimensional aspects of the fields are of great significance. In the research of high-speed flow field including shock waves the common flow visualization methods are shadowgraph, color-schlieren, and interferometric methods. In these methods the three-dimensional (3-D) density information is integrated along an optical observation axis and go down to two-dimensional (2-D) in the represented image. The 3-D measurement of the complicated flow field including various phenomena has not been developed especially in high speed gasdynamic research. Experimental data are in the poor situation.