This article describes how to modify an ordinary webcam to capture images in the near infrared wavelength. All that is needed are two very small pieces of completely black photographic negative. If you do not have any negatives, a small
piece of the inside of a floppy-disk will do as well.
Step 1

Open the webcam casing.
Step 2

Unscrew the lens assembly from the camera PCB.
Step 3

Remove the small piece of glass that appears to reflect red light, on the back of the lens.
Step 4

Cut two pieces of black photographic negative the same size as the glass you just removed.
Step 5

Fit the negative pieces where the glass was.
Step 6
Re-assemble the camera. Be sure to use either daylight or incandescent lighting and the webcam will now see in infra red. If you leave the negative squares out the only color the camera will pick up is red black and white.