basically, by taking out a filter.
I'd assume that it works on more expensive CCD cameras too, they all use silicon.
Edit: www.kailashnadh.name/docs/ir_cam/ir_cam.html
although I have no idea what an "X-ray filter" is. I can imagine anything which passes IR light and blocks visible will do, like the filter on an old remote control (or the cover over the remote control sensor on the front of your TV).
Nothing might do also, but then you get a picture of the visible light too.
(, Wed 11 Mar 2009, 11:48, Reply)
wouldnt happen to be the material x-rays are printed on would it?
(, Wed 11 Mar 2009, 12:20, Reply)