Low power retro-reflective communications system and method
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United States of America Patent
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Apr 23, 2013
Grant Date -
Jun 2, 2011
app pub date -
Dec 1, 2009
filing date -
Dec 1, 2009
priority date (Note) -
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Abstract
Presented is a low-power retro-reflective communication system that reflects modulated light back in substantially the same direction as the light source using a retro-reflector. The light modulator in the retro-reflector modulates the light in response to a stimulus, such as an electrical communications stimulus or an environmental stimulus. In embodiments, the retro-reflector is a corner-cube retro-reflector and the modulator is one of the reflecting surfaces, or a spherical retro-reflector and the light modulator is a variably reflecting backing.
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