Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-03-31
2000-05-16
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
362298, H07J 314, F21V 700
Patent
active
060640618
ABSTRACT:
Many applications of radiant energy transducer systems call for specific performance characteristics over desired fields of view or footprints on identified surfaces. Constructive occlusion utilizes a mask sized and positioned to occlude an active optical area, such as an aperture of a diffusely reflective cavity, so as to provide a tailored performance characteristic. Use of principles of constructive occlusion alone or in combination with several other techniques enable tailoring of the illumination distribution or the sensitivity profile of a radiant energy transducer system to meet the demands of specific applications. One mechanism used to further tailor performance involves a non-diffuse reflective shoulder along a peripheral section of the mask and cavity type system. Another technique involves using a retro-reflective surface, for example along a portion of the periphery of the system, to limit the angular field of view and to redirect light back into the system for emission within the desired field. Another technique involves use of a reflective wall along one side of the system, to limit the field of view to angles on the opposite side of the axis of the mask and cavity configuration.
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Green Albert
Phillips E. Alan
Rains, Jr. Jack C.
Ramer David P.
Reim John F.
Advanced Optical Technologies, L.L.C.
Kinnear Glenn T
Westin Edward P.
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