Attached are two images taken using thermal imaging. Anyone want to try reproducing them with their imager.
Any Level 1,2, or 3 guys out there try to keep from posting any comments and giving the secret away to everyone else. Lets try to make this a learning experience.
Look at the second picture Dave. IR can pass through glass. That is an image of the actual filament, not a reflection. I know you know how this was done and can be reproduced, but lets hear it from some of the other guys.
Not being an IR guy my first thought was this image had to be taken immediately after the bulb was lit in order to produce the image before the the glass heated up.
Reason is that once the bulb has been lit for a while you would only see the shape of the glass as it heats up and not the filament.
I would assume if that is true that it is due to the fact you are getting distortion from reflective quality (or distortion) of bent light through the highly concave or convex thicker glass.
Light bulb glass is very thin and also has a vacuum which does not retain heat inside it.Your skin temperature would radiate into a thick glass.