14 September 2007 Adapting radio technology to LED feedback systems
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Abstract
Superheterodyne techniques were originally developed for radio transmission and reception nearly a century ago. In this paper we explore the adaptation of this technology to the problem of simultaneously monitoring the intensities of multiple LED channels with a single photosensor. The use of superheterodyne techniques obviates the need for multiple photosensors filters and tristimulus color filters to monitor the relative intensities of red, green, and blue LEDs. In addition, they alleviate the problems of electrical and optical noise, as well as the influence of ambient illumination on the photosensors. They can also be used to advantage with phosphor-coated white light LEDs in solid state lighting systems. Taking a broader view, the use of such techniques demonstrates the value of looking outside the realm of conventional LED power and control technologies when designing solid state lighting systems.
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Marc Salsbury, Ian Ashdown, "Adapting radio technology to LED feedback systems", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666912 (14 September 2007); doi: 10.1117/12.732522; https://doi.org/10.1117/12.732522
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