what is the other direction? (I am having hard time following the flow of thought in this particular thread)
harry On Sun, Oct 12, 2014 at 10:31 PM, David Roberson <dlrober...@aol.com> wrote: > How does the emissivity of the alumina effect the optical appearance with > regard to color? Is it possible for most of the energy to be emitted in > the IR spectrum while limited at optical wavelengths? > > I recall looking at a piece of brightly glowing insulator in some NASA > photo. The material was being held within a volunteer's hand and did not > burn that person. Had the radiation been emitted at the level expected by > the brightness, the person would have suffered severe burns. Could this > process work in the other direction such as we seem to question in this > discussion? > > Dave > > > > -----Original Message----- > From: a.ashfield <a.ashfi...@verizon.net> > To: vortex-l <vortex-l@eskimo.com> > Sent: Sun, Oct 12, 2014 4:39 pm > Subject: Re: [Vo]:Incandescence is the wrong color > > Jed, > > As someone experienced with working at these kinds of temperatures in > the glass industry, it was obvious that the temperature shown in the > image is way below the reported operating temperature. > I don't know whether this is because it was warming up, or because many > consumer cameras don't show red hot things correctly. > > I am now somewhat dated, but I would have used a type S platinum > thermocouple, at the reported temperature, for the reactor control and > would have reported that reading as a useful check against the IR > reading. I also wonder what they used for the heating element as > that would have to be good for 1500C > > >
