Invention Grant
US08686371B1 Using of enhanced retroreflectors for non-visible light 失效
使用增强型后向反射器进行非可见光

Using of enhanced retroreflectors for non-visible light
Abstract:
This is a way interrogating an object using retro-reflection of non-visible light. It uses e.g. IR transmitted toward the object from a distance and covertly detects the retro-reflection. Highly reflective passive non-visible light retroreflectors on the object reflects and refracts light back toward the light transmitter, with the returned light being very nearly parallel to the light from a narrow beam light transmitter.
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