3. Tomographic methods
A mechanically optimized tracer is useless if it cannot be easily detected by the light it emits.
In this respect, the size criterion is antagonistic to dynamic behavior: a submicron tracer, ideal for tracking changes in fluid direction or acceleration, does not always diffuse a recordable quantity of light; only a careful analysis of lighting and diffusion conditions can enable a compromise to be chosen. For quantities of tracers that are small enough to remain undisturbed, only the power density of a laser light can enable easily exploitable observation. This idea gave rise to the principle of distributed "sheet" illumination, obtained by spreading a laser beam using an optical system originally consisting of a simple cylindrical glass rod
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Tomographic methods
Static tomographic lighting
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