Trolinger, James D. Spectron Development Laboratories, Costa Mesa, California.
Last reviewed:January 2020
- Knife-edge method
- Color schlieren
- Use of coherent light
- Related Primary Literature
- Additional Reading
Any technique for the photographic recording of schlieren, which are regions or stria in a medium that is surrounded by a medium of different refractive index. Refractive index gradients in transparent media cause light rays to bend (refract) in the direction of increasing refractive index. This is a result of the reduced light velocity in a higher-refractive-index material. This phenomenon is exploited in viewing the schlieren, with schlieren photographs as the result. Modern schlieren systems are rarely limited to photography; electronic video recorders, scanning diode array cameras, and holography are widely used as supplements. See also: Holography; Optical detectors; Photography; Refraction of waves; Shadowgraph
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