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Infrared sensor distance

Hi, I'm doing my final proyect and I'm having problems figuring out the infrared emitter. The problem is that the sensor has to have 10 meters range sensitivity. So the beam has to reach the object and come back. That's 20 meters. I'm doing the oscilation with a 555 in astable mode, to provide me 10KHz to 40Khz.

I've already tried the circuit with a IR Led I had, but the range is less than 10 meters.

Any clues about what can I do?

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I've considered using a motion sensor (available at most hardware stores) for the purpose of detecting animals. They are commonly used on outdoor motion activated lights.