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 : $\frac{δ I}{I} \approx a \int_{A}^{B} (\frac{\partial^{2}}{\partial x^{2}} + \frac{\partial^{2}}{\partial z^{2}}) \ln$

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Shadow method: ombrography or ombroscopy

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Bibliography

Text references

(1) - CHENG (K.C.) - A history of Flow Visualization : Chronology. - Journal or Flow Visualization and Image Processing 4-1, 1997, p. 9-27.
(2) - MERZKIRCH (W.) - Flow Visualization. - Academic Press, 1987....