Schlieren optics is an optical technique that enables the user to image small changes and non-uniformities in the refractive index of air, or other transparent media; and are most commonly used to image air flows.
How does a schlieren system work?
The first step to understanding how a schlieren system works is to look at how the light propagates through the optics. The most basic type of schlieren system uses a straight line of lenses and parallel beams of light, where the light passes through a slit and is focused by the first lens.
What is the schlieren effect in a light blocker?
If this change in light source passes around the light blocker, then it will be imaged as streaks of light in the area where the change in the index of refraction occurred. This is known as the schlieren effect.
What is Schlieren visualization smaller than 1?
Ae104b, Winter 2014 Schlieren Visualization smaller than 1. Refractive indices of transparent liquids and solids are much higher than those of gases, so much less optical sensitivity is required to observe refractions in liquids or solids than gases [1].
