Here is a simple way to spot IR leakage.

[Phazonx]

Hi, I thought my thread would be nice to have in the greens section too.

so here it is.

http://www.laserpointerforums.com/forums/YaBB.pl?num=1197926836

There is a video at that link.

 

[xanatos]

My only question is - how do you know that what's passing is actually IR and not just green that is below the visual detection threshold of the eye, but not the camera? If it's true that this IS IR, then it's pretty cool, but I'd need to know if it really is IR for sure.

Do you have an IR filter you can use to pass the "possible IR" beam through to see if it is attenuated or passed?

I've been collecting IR filters from several old dead video & digital cameras - if you don't have one you might be able to scrounge one from something like that.

Dave

 

[Rhith]

Good stuff! I might have to try it out if I can even find some film negatives around here.

 

[Phazonx]

I'm pretty sure its IR. These film negatives are supposed to pass IR through it.

From what I see, if you can't see it, its dangerous.

 

[xanatos]

From what I see, if you can't see it, its dangerous.

Good philosophy!

I'll have to play with this sometime and see what various things pass/block IR. Thanks!

 

[Phazonx]

I know for sure that Glass reflects IR.

 

[Benm]

Glass reflects near IR about as well as visible light, in the order of 4% for a clean, but uncoated, piece of glass at or near a normal angle.

 

[Cyparagon]

Mid-IR only.