I’m often struck by the powerful and iconic words of Bram Stoker who, in Dracula, referred to "the light of all lights." Intuitively, it is the wish of those who design to capture and utilize light, ...

A typical reflective object sensor consists of an infrared light emitter diode (IRED) and an NPN silicon phototransistor mounted side-by-side on parallel axes in a compact black plastic housing. The ...