Visualization and investigation of supersonic air micro jets (SAMJ) as weak phase objects present serious problems when done through classical visualizing methods. Usage of advanced holographic interference techniques would make the study and evaluation of characteristic densities, density gradients and jet’s structure (weak shocks followed by expansion waves) more successful. It should be remarked, that the applications of Mach-Zehnder (reference) and shear dual-hologram techniques, which were performed in earlier works, have been done separately and have a demonstrative character. In the present paper, the authors have tried to apply both the dual-hologram techniques, simultaneously. This approach makes it possible to measure the same phase object under study by reference beam and shear interference techniques using only Mach-Zehnder holograms. Finally, experimental data obtained from both the techniques were numerically compared and found to be more applicable. It was first experimentally shown that sensitivity of shear interference approach during evaluations of radial component of density gradients in a micro jet can be enhanced by using the technique of re-recording holograms. The effect of fast transition to a transonic regime accompanied by expansion and later on with disintegration of a jet was observed and jet’s densities and radii in transition region were evaluated. As a whole, method of co-joint application of reference beam and shear dual-hologram interferometry has shown its self-descriptiveness, flexibility and utility for optical diagnostics of a weak gas dynamic micro object, the supersonic air micro jet.
Experiments in Fluids – Springer Journals
Published: May 9, 2007
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