optris Top-down GIS, Руководство оператора

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Basics of glass measurement 41
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No to little space for cameras to measure from below due to the low furnace height of the system. This
would require more than one camera and the wide angle has a different influence.
5.5 Angle dependency
The angle dependence is another important factor to be considered when measuring temperature.
On the uncoated side the values are constant up to an angle of 45°.
On the coated side (low-E) the 60° optics is preferred, since the influence of the emissivity change is negligible
here.
The following two figures show the emissivity as a function of angle (G5, G7, LT) for Low-E glass at 250 °C.
Once for coated glass and once for uncoated glass.