Some Points Regarding a Recent Presentation at ICCF20 on the ‘Lugano Report’ (Rainer Rander)

Quote from ele

1) You don't need MFMP to know allumina band Emissivity

2) What they measured was total emissivity and if they not used pure Alumina then what they measured have nothing to do with Lugano

3) In one of their experiments they are trying to measure the emissivity of a body that was in an oven. Because the oven is a cavity is natural that the emissivity of any material result very near to the black body emissivity.

And BTW the argument of emissivity factors cancelling is true and your is disinformation.

Is not a coincidence that after a long time of silence you came out now with that.

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What is required to measure total emissivity is a total radiometer and a strong vacuum.

Here are some textbook examples of spectral radiance calculations, and integration of the emissivity a selective emitter using a step function.

Quote from Paradigmnoia

What is required to measure total emissivity is a total radiometer and a strong vacuum.

No my dear it can be much simpler if you have a reference material. The reference dot are a good reference material for T<350 °C approx. Beyond that the Kapton substrate is damaged.

Quote from Paradigmnoia

Here are some textbook examples of spectral radiance calculations,

Nice to see that you are studying you want me to explain the formulas ?

What is needed is the total hemispherical emissivity.

rb0 ,

The Optris camera cannot see outside of its spectral sensitivity range, so total emissivity is useless for the camera setting, unless the object is a true grey body or black body, in which case spectral and total emissivity are the same.

The camera lenses and microbolometers are tuned only for the spectral sensitivity range of the camera. Wavelengths outside of the camera spectral sensitivity range are invisible to the camera optics. All IR wavelengths are not required for determining the surface temperature of an object.

The Optris camera is spectrally limited to one of three bands, which are related to IR transmissive windows in the atmospheric IR absorption spectra.

Quote from rb0

Nice to see that you are studying you want me to explain the formulas ?

What is needed is the total hemispherical emissivity.

Actually we have waiting for your integrations you promised us, for months and months already.

Quote from Paradigmnoia

The camera lenses and microbolometers are tuned only for the spectral sensitivity range of the camera. Wavelengths outside of the camera spectral sensitivity range are invisible to the camera optics. All IR wavelengths are not required for determining the surface temperature of an object.

@PGM: Did you finally study the full Optris tech manual? MFP has found the same T³ dependency I taught you and THH since months...

Finally the Optris camera uses filters to block other wave-ranges, thats the correct explanation!

Further on we agree, that using Optical measurement is only adequate, if you have an identical dummy at the very same temperature, with at least two other measurements (T-coupler and input Wattage comparing) running in parallel.