- 1 - 2 . 0 Qualification of Optical Material
نویسنده
چکیده
Bubbles, seeds, stones, and striae can be detected by illuminating the sample with a bright light and observing the scattered light. The use of a shadow graph or Foucault knife-edge (Schlieren) is very useful in detecting internal defects. In the Schlieren test, shown in Fig. 2-1, the irregularities become visible since they deviate light past the stop. If the surfaces are not polished, they may be "indexed out" by use of an index matching fluid and glass plates of trusted quality. Internal defects must be a minimum for systems having low scatter requirements and elements used near a focal plane such as a field lens or reticles.
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