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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You can make a blocking filter for visible light using exposed positive film so only the IR goes through, then you can try to detect the IR. I did it with a red laser pointer and it had a weak IR output. If the IR filter is not very good then it should be easy to detect since the IR laser is quite powerful. If it is very good you might need to take a long exposure photograph with a camera or possibly use a photofiode.
Cheaper cameras are better than expensive ones since they don't contain quality IR blocking filters. Cheap webcameras and the cheapest B/W video cameras are usually very sensitive to IR.
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12 year old with a burning laser
