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Schileren Photograph

  1. Nov 27, 2004 #1

    Clausius2

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    I've been googling for some time but I haven't found anything interesting about.

    Does anybody know here how is produced a Schileren photograph and which are its physical principles? It is used a lot visualizing flows at wind tunnels. But I don't know what does it represent physically and which is the mechanism for producing the image.

    Thanks.
     
  2. jcsd
  3. Nov 30, 2004 #2

    Bystander

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    A pressure gradient is necessary to force flow; that gradient implies a density gradient in any real fluid, and that implies a refractive index gradient. Illumination with a collimated source, or imaging with a high f-stop, reveals all density gradients that are not parallel to the direction of illumination as bright (converged light) or dark (diverged rays) on a film or shadow screen.

    add this ---- SCHLIEREN
     
    Last edited: Nov 30, 2004
  4. Dec 1, 2004 #3

    Clausius2

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    OOPPS! Thanks for the correction.

    And thanks for your explanation. Thank you very much. :smile:
     
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