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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 :
a being the distance separating the flow from the screen....
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Shadow method: ombrography or ombroscopy
Strioscopy
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