产 品 说 明                                                                                                                          

• A  Schlieren device is an optical system that displays the refractive  index distributions of minute (virtually invisible to unaided vision)  transparent samples as amplified patterns of light and shade.

• If  minute sample differences in refractive index exist in the parallel  beam, light outgoing from the sample has a slightly divergent optical  axis and focuses on a different spot. Eliminating the off-focus light  with a knife edge makes it possible to project light with greater  contrast.