The good news : In fig 6 the transmittance of alumina drops off by 5um,, and drops off quicker at higher temperatures.
The bad news : In fig 7 the emittance varies greatly by wavelength (1.0 to 0.15), and also varies by temperature. Levi et al do not mention the variation by wavelength, only temperature (Fig 6, plot1). I don't know whether the IR camera system takes this into account. And we still have the problem of a system calibrated at 450C being used at 1400C ----- Original Message ----- From: "Jed Rothwell" <[email protected]> To: [email protected] Sent: Monday, October 13, 2014 6:23:11 AM Subject: [Vo]:Determining the transmittance . . . of semitransparent materials at elevated temperatures A corespondent sent me this link: http://www.eurotherm2008.tue.nl/Proceedings_Eurotherm2008/papers/Radiation/RAD_6.pdf He commented: "My interpretation of figure 6 is that the tranmissivity of alumina goes down to zero. Hence, this shows the arguments about alumina translucency are moot." - Jed
