I wrote:
> Macroscopic changes in temperature are very slow compared to the kinds of > pulses a camera might capture. > I mean they all blur together. If there are moving pulses of heat under the alumina, by the time the heat reaches the surface it blurs together and you would not see light and dark areas with an IR camera or by any other technique. They do not exist. The surface is all the same temperature to within micro-degrees. With the right equipment you might see moving waves of tiny temperature differences. - Jed
