It has moderate transmissivity in the visible range, which is what the photograph shows. But it drops to zero by 6 and above, which is what the IR camera is measuring.
So there could be visible shadows / glowing resistors seen through the ceramic, but the IR calculations are OK. ----- Original Message ----- From: "H Veeder" <hveeder...@gmail.com> Sent: Monday, October 13, 2014 11:27:44 PM 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." ​does this imply the dark bands are not cast shadows? Harry
