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How to narrow an IR beam which comes from several IR LEDs at one place? Can I use a lens for this? Answered

How to narrow an IR beam which comes from several IR LEDs at one place? Can I use a lens for this? This is for a university project which is to track an IR beam's pointer movement.

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lks0912

8 years ago

The issue was resolved naturally. For the project we had to capture the IR beam from a distance (about 5m). We just attached three IR LEDs as sources and used the IR detecting camera to capture. Naturally with the distance of 5m, all 3 IR sources were seen as one source (at this distance). No problem occurred!!!
Thank you for your comments and enlightenment...

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matt ledding

9 years ago

Instead of fixing things afterwards, why not buy leds with narrower focus, or best and narrowest of all... get an IR laser. (use carefully, what you can't see CAN hurt you...)

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steveastrouk

Best Answer 9 years ago

Ideally you need to collimate (make parallel) the beams from each LED. Then you'd combine them in another optic, then recollimate the beam..... It might be worth trying to use fresnel lenses to do it, but you might be better off just using a damned great big IR illuminator like these
http://tech-led.com/High_Power_Illuminators.shtml