> From: "Jed Rothwell" <[email protected]> > Sent: Monday, October 13, 2014 3:23:26 PM > I confess I am going by the Wikipedia color bar here:
> http://en.wikipedia.org/wiki/Incandescence#mediaviewer/File:Incandescence_Color.jpg > > I am just eyeballing it. As I just mentioned you have to bring up a copy of > the color bar on the screen next to the Acrobat document. I printed the > document and got a different orange. > Srinivasan told me ~1300°C is a yellowish color similar to the one shown on > this bar for 1200°C. I think it is what you see with some an old-fashioned > incandescent bulbs. > Those bulbs produced a wide range of colors. I wouldn't put too much faith in a jpg photo from an unknown camera, shot with unknown settings, an unknown color space and unknown post-processing. Secondly, what material is used for the wiki Incandescence color? (Where did that picture come from, anyway?) Look again at the Manara paper for Alumina. Figure 5 : the emittance value increases almost linearly over the visible range, from 0.1 to 0.95 That means that the proportion of red light emitted will be greater than blue light, so I would EXPECT an orange/red cast. Figure 6 : this is complicated by transmission, which may be happening in the visible range. (IF the helical shadows are indeed images or shadows of the coiuls. But I still think they represent different conduction zones of a ceramic holder, as in the March test). However, this has a broad peak near the center of the visible range, so the blue might be enhanced a little. In short : not enough information. And we don't even know when the picture was taken. Speaking of which, we don't even have a thermographic image taken DURING the run.
