As the means of close quarters , indoor communication , infrared ray is preponderant to radio . old infrared remot controlling and measuring system is based on beamed infrared transmitter and so is mostly single - user system 作為近距離、室內(nèi)通信的手段,紅外線具有無線電無法比擬的優(yōu)勢。以前的紅外遙控遙測系統(tǒng)以定向發(fā)射、接收為主流應(yīng)用,因此一般為單用戶系統(tǒng)。