>From the experiments we have conducted, if a 1 micron wavelength Williamson pyrometer had been used, I would say the whole measurement would be wrong. However, at the 6-13 micron wavelength of the Optris, I am leaning toward the average temperature having been measured correctly by the Optris. I think the visible light color the eye sees is somewhere between the surface blackbody color and the internal heater temperature color - but only for the wavelengths to about 3 microns.
When I said that the light from the heater coils would have been "reddened", that is due to absorption of shorter wavelength photons and turning them into heat (this is not a reflective filter). The alumina transmission cuts off between 3-4 microns, particularly for the polycrystalline material with lots of grain boundaries and silicates in those grain boundaries. That light of wavelength shorter than 3 microns will be to some extent transmitted and attenuated a lot - with the attenuated photons turning into heat in the ceramic. Photons emitted by the heater coil at a wavelength longer than 4 microns will be turned into heat inside the alumina. So, unless the Optris has an unexpected sensitivity to light shorter than 6 microns, then it should assess the average temperature correctly. Still, there is that residual doubt and that is why the MFMP experiment is being conducted where there will be direct surface temperature measurement along with the Optris temperature assessments. There won't be a 4th power error. At any given temperature, in the dogbone experiment, the heat out will be equal to the electrical power input, so we will know exactly what the heat output is at any given surface temperature and any given Optris assessed temperature. Bob On Mon, Dec 22, 2014 at 5:55 PM, Jones Beene <[email protected]> wrote: > *From:* Bob Higgins > > > > Ø Being opaque, it means that the Optris camera was NOT measuring the > higher internal temperature of the hotCat reaction core or heater coil, but > just the surface. > > > > Bob, wait a second … just today - in an earlier post you said (correctly) > “Because of the porosity of the alumina, the ceramic is a reddening (low > pass) filter… > > > > … or was that quote from Ryan? > > > > Anyway, the problem is not just that the dog-bone is acting as a low pass > filter, but moreover the “calculation” exponentially inflates the effect of > any radiation that is passed, so that in the end, the reddening is > amplified by a fourth power into what could be an artificially inflated > temperature estimate. > > > > Rossi’s cadre of gullible cheerleaders, here and on E-Cat World, seem to > be immune to the basic problem. Rossi never measured temperature – he > computed it with a formula that has a 4th power amplification of systemic > error. Levi could have used a platinum thermocouple to confirm, and thereby > have salvaged something – but he did not. > > > > Continuing from your earlier post: “so the light from the much hotter > internal heater coils will be reddened as it is transmitted. I have > experimented with up to 5mm of alumina ceramic with a red diode laser, and > while there is a lot of scattering, there is also a lot of bulk > transmission.” > > > > Bottom line: “a lot of bulk transmission” can skew the numbers, even a > little can. > > > > The calculated temperature of the Lugano report could be grossly in error. > > >
