Exploring the colors some more. If you zoom in on the hottest area and use a color picker to get the color, you can compare that specific color with a color temperature chart.
Looking at the hottest spot, the temperature could be between 1570C and 2426C. I used the color picker in Gimp to get this color #f89660. Unless I am misunderstanding something, it seems quite possible that it is as hot as they measured with the thermal imaging cameras. I used the picture taken in the dark to remove any reflected light. On Mon, Oct 13, 2014 at 7:21 AM, Jack Cole <[email protected]> wrote: > Additionally, I think we may be able to examine the issue more > experimentally by using similar materials. > > For example, here is a spiral grooved alumina tube. > > > http://dengfengjinyu.en.made-in-china.com/product/KqaEYeWMfSVC/China-Alumina-Tube-Spiral-Groove-.html > > On Mon, Oct 13, 2014 at 6:12 AM, Jack Cole <[email protected]> wrote: > >> The trouble is, we don't know when that picture was taken and to what >> extent the camera affected the color. >> >> I suspect one of the engineers here could take the temperature data from >> the caps vs. the core area and compare the dummy vs. the active run. Since >> the caps are not incandescent, perhaps this would be useful to examine. >> >> Just looking at Delta T/Watt of the caps doesn't seem to be consistent >> with what I would expect with the core being 1400C. At the same time, >> there is a suggestion of excess heating to me in the shift from 800 to 900W >> (just considering the caps). I think someone good at thermodynamics in >> solids could figure this out. >> >> On Sun, Oct 12, 2014 at 11:45 PM, H Veeder <[email protected]> wrote: >> >>> >>> >>> On Sun, Oct 12, 2014 at 11:43 PM, David Roberson <[email protected]> >>> wrote: >>> >>>> I refer to the opposite effect in this case Harry. In other words, >>>> can the color appear to be too dark in the visual region to our eyes >>>> compared to the emission of thermal energy in the IR. >>>> >>>> Are there surfaces that are very poor emitters of energy in the visual >>>> region that behave more like a black body in the infrared region? This is >>>> more of a question instead of a statement since it seems like that might be >>>> happening in this special case. The light emitted does not have a color >>>> that matches what is expected to be seen from a surface of a broad band >>>> black body. I wonder if anyone on the list has seen materials with that >>>> characteristic. >>>> >>>> If you consider the behavior of a RF radio transmitter, you will >>>> understand the jest of my question. In that case, the amount of power at >>>> its transmission frequency, being narrow band and so low in Hertz, would >>>> indicate a black body that was at an enormous temperature if the complete >>>> spectrum were available as expected. But we know that it does not >>>> represent a true black body since it is narrow band. Can anything of a >>>> similar nature exist at other frequency ranges such as IR? >>>> >>>> >>> The blackbody would still have a low temperature if the distribution >>> peeked at radio wave lengths which are much longer than light waves. See >>> how the temperature peek of a blackbody declines as wavelength increases: >>> http://voyager.egglescliffe.org.uk/physics/astronomy/blackbody/Image21b.gif >>> >>> You are struggling to find an explanation which is consistent with the >>> claim of excess energy and with the 2nd law of thermodynamics (heat flows >>> from a hotter region to a cooler region). Can it be done? You can >>> disregard what I am about to say since I am not expert in these matters but >>> I think a choice has to be made. Either there is no excess energy or the >>> 2nd law has broken down in this system. >>> >>> Harry >>> >> >> >
