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Optical Techniques for Flow Visualization

Optical Techniques for Flow Visualization. Shadowgraph Schlieren Interferometer. All depend of the fact that the speed of light and therefore the index of refraction varies with the density. The index of refraction is approximately. Shadowgraph. Shocks appear as a dark line followed

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Optical Techniques for Flow Visualization

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  1. Optical Techniques for Flow Visualization • Shadowgraph • Schlieren • Interferometer All depend of the fact that the speed of light and therefore the index of refraction varies with the density. The index of refraction is approximately

  2. Shadowgraph Shocks appear as a dark line followed by a light line Viewing Screen deflection Point Source of light Flow

  3. Shadowgraph

  4. Mask (knife edge) c d’ a b’ a’ b c’ Image of Test Section Image of source Light Source d Test Section Schlieren Optics Knife edge Knife edge intercepts part of source image Density gradient causes displacement of source image Color Schlieren uses a color in place of knife edge Displaced Image Image

  5. Z-folded Schlieren Using Mirrors Camera Knife edge Test Section Light Source

  6. Color Schlieren

  7. Schlieren for Flight Test

  8. Mach-Zender Interferometer Light Source Beamsplitter Mirror Mirror Image Beamsplitter Test Section

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