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3. Strioscopy
A distinction is made between strioscopy with incoherent lighting (Toepler-Foucault or "schlieren" method), based on geometrical optics and the deflection of light rays, and strioscopy with coherent lighting (laser), based on the notion of spatial frequency filtering.
3.1 Strioscopy with incoherent lighting (schlieren)
An incoherent rectangular source S illuminates the flow to be studied (figure 4 ); an optical system forms an image S' of this source on an opaque half-plane with an edge parallel to Ox (knife C), which partially obscures it. In the image of the flow at P', variations in illumination ΔE appear, proportional to the displacements...
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Strioscopy
Interferometric techniques
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