| schlieren | See: schlieren optics. (05 Mar 2000) |
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| schlieren method | <radiobiology> An optical technique that detects density gradients occuring in a fluid flow. In its simplest form, light from a slit is collimated by a lens and focused onto a knife edge by a second lens, the flow pattern is placed between the two lenses, and the resulting diffraction pattern is observed on a screen or photographic film placed behind the knife edge. (09 Oct 1997) |
| Schlieren system | <microscopy> A system for enhancing path length differences, refractive index differences in transparent media, or height differences for light reflected from surfaces. (05 Aug 1998) |