We have obtained analytical formulas for the phase difference in case of two-beam interferometry of symmetrical flow with inner shocks. These formulas were analyzed for transparent media having axial, central and cylindrical symmetry. They were used to digitally synthesize the interferometric pictures in density distribution simulations.
It is of interest to study the interferometric fringes behavior in the areas near the inner shocks. It is proposed to use simple models for the density field simulation so results of the calculations can be compared with the experimental interferometric results. Using simulated density fields and digital interferometry, we have numerically created interferograms utilizing some of the continuous field techniques developed by authors early.
The comparison of the experimental interferometric pictures with the calculated pictures shows the possibility to use the developed technology to study flow fields with the inner shocks. The results of comparison are illustrated by examples of such interferometric pictures.