Either I'm missing something, or there's a fundamental error in people's understanding of "IR". The "IR" in question is simply a transmission medium, which conveniently modulated in the 25 - 50KHz area can be detected against a background of low (...) (24 years ago, 27-Apr-00, to lugnet.robotics)
On the following link under the section infrared you find a good explanation of IR senders and receivers . (...) (24 years ago, 28-Apr-00, to lugnet.robotics)
