Following some tutorials (grynx, hoagieshouse) I modified my webcam (Philips PCVC740K) to use near infrared light, which is invisible to the human eye.
The two basic steps are to remove the original IR blocking filter from the backside of the lens assembly and replace it with a few layers of unexposed but developed color negatives as IR pass filter.
The PCVC740K uses the ICX098AK CCD chip with the sensitivity documented in the datasheet.
The first two pictures show various things in visible light and in near IR, the two last pictures show my wrist and arm, exposing bloodvessels.
vague but exciting …