Shadow method: ombrography or ombroscopy
Fluid mechanics - Visualization by index variation
Article REF: AF3332 V1
Shadow method: ombrography or ombroscopy
Fluid mechanics - Visualization by index variation

Authors : Jean-Pierre PRENEL, Paul SMIGIELSKI

Publication date: July 10, 1999 | Lire en français

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2. Shadow method: ombrography or ombroscopy

By recording the variations in illuminance observed on screen E (figure 1 ), we obtain a photograph of the flow using the shadowgraphy method.

If I is the illuminance at P, I + δ I the illuminance at P', we have with the assumptions made above : δII≈a∫AB(∂2∂x2+∂2∂z2)ln

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