[image: figure 6] >From the graph, 1300C looks like a 2micron wave length, this corresponds to a transmittance of about .85,
On Fri, Oct 10, 2014 at 9:10 PM, Jed Rothwell <[email protected]> wrote: > A correspondent wrote to me (not an exact quote): > > a quick look a the literature scrub shows transmissivity of alumina > quickly drops to zero past ~7 micron wavelength. Much of the data seems to > be in relation to the crystalline variant (e.g sapphire) vs > non-crystalline. > > > http://www.janis.com/Libraries/Window_Transmissions/Sapphire_Al2O3_TransmissionCurveDataSheet.sflb.ashx > > Notice the Ecat report clearly states on page 4 “The spectral range for > both cameras is from 7.5 to 13 μm.” That seems to indicate that any > transmitted IR through the alumina wouldn’t be detected by the IR cameras. >
