PIR Sensor - Image citation

[Frodob]

I was reading your (great) PIR "How to Use.." page, and followed the link to the Glolab site, and found the image you needed a citation for on their focusing devices page ( http://www.glolab.com/focusdevices/focus.html ). A modified version is also on the PIR page you link to at Glolab.

Edit: Also on the NYU page (http://itp.nyu.edu/physcomp/sensors/Rep ... aRedSensor)