DARK-FIELD ILLUMINATION SYSTEM
A means was developed for viewing objects against a dark background from a viewing point close to the light which illuminates the objects and under conditions where the back scattering of light by the objects is minimal. A broad light retro-directing member on the opposite side of the objects from the light returns direct light back towards the source while directing other light away from the viewing point. The viewing point is offset from the light and thus receives only light which is forwardly scattered by an object while returning towards the source. The object is seen, at its true location, against a dark background. The invention is particularly adapted for illuminating and viewing nuclear particle tracks in a liquid hydrogen bubble chamber through a single chamber window. (AEC)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-027399
- Assignee:
- U.S. Atomic Energy Commission
- Patent Number(s):
- US 3045528
- OSTI ID:
- 4792077
- Country of Publication:
- United States
- Language:
- English
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