IR wireless

Some engineers consider IR technology to be a sub-specialty of optical technology. The hardware is similar, and the two forms of energy behave in much the same way. But strictly speaking, "optical" refers to visibleelectromagnetic radiation, while "infrared" is invisible to the unaidedeye. To compound the confusion, IR is sometimes called "infrared light."IR wireless is used for short- and medium-range communications andcontrol. Some systems operate in line-of-sight mode; this means that theremust be a visually unobstructed straight line through space between the transmitter(source) and receiver (destination). Other systems operate in diffuse mode,also called scatter mode. This type of system can function when the sourceand destination are not directly visible to each other. An example is a televisionremote-control box. The box does not have to be pointed directly at the set,although the box must be in the same room as the set, or just outside the room with thedoor open.