Focusing an IR beam?

[450nm]

There's probably an easy answer but I don't know it. How do I focus an IR beam when I can't see it?

I have only basic kit, i.e. DVM etc.

Thanks - Dave

[VJ AIWAZ]

use a video camera

[450nm]

use a video camera

LOL Thanks - I knew there was an easy answer.

[450nm]

No good. Pointed it at webcam and can hardly see anything so assume diode is shagged

[VJ AIWAZ]

no dont point it at the cam

use the cam to veiw the beam and the spot

[VJ AIWAZ]

and your web cam may have a ir filter

[Lampy]

Works even better with a monochrome video camera such as an old CCTV camera.

[carmangary]

Use a cam with night vision and a some fog to help see the beam.

[mixedgas]

Use a cam with night vision and a some fog to help see the beam.

Color webcams will have a IR filter, its a blue piece of plastic, pop it off and volia, a IR camera. B&W webcams will work just as well.

if not head over to supercircuits.com and buy a 19$ B&W camera.

Steve Roberts

[allthatwhichis]

I use my Sony DV Cam and turn on the "night shots" setting. Again you are looking for the dot on the wall, not the "low" power reddish light down the barrel...