On Mon, 30 Nov 2009 13:04:05 -0000, Ragnar wrote:

It seems that an ordinary webcam will detect IR quite well but has a
filter built-in to stop the IR messing up the image. Remove the filter
and you have an IR camera! Of course it's a bit more complicated than I
make it sound.

This is true but this is near infrared not far infrared (heat) that
the IR cameras on Police helos use to spot scroats hiding in the
bushes.

You can certainly use a webcam and near infra red but you will
probably have to provide an IR light source. A couple of IR LEDs
"borrowed" from a TV remote probably won't be enough.

--
Cheers
Dave.