I'm thinking about making a long-distance IR detector. The IR source will be a 10W 950nm LED, and I'm using a simple IR LED to detect it. The signal is very weak at long distances (tens of meters), so I thought about modulating the source signal and locking in on it using some kind of IC which can demodulate and amplify the signal. Is there an easy way to do it in an arduino? Which ICs do you recommend?