4. Inconsistent imaging techniques

4.1 Umbroscopy

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4.1.1 Principle

Generally speaking, imaging techniques record and analyze intensity images of the objects to be characterized. For flows, shadowgraphy is the preferred configuration. Illumination is collimated and comes from behind the particles. Detection uses a matrix camera with a high-magnification lens, placed in front of the illumination source. This is to observe the shadow of the particles rather than their surface, which is parasitized by multiple reflections. The measurement then consists of...