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EmissivityMetalcoating
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Rich Barton

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Metals, especially with a smooth or polished surface that appears reflective, can have very low emissivity (<< 0.30).  In order to accurately measure the temperature of these surfaces, there are a number of methods available depending on surface features and characteristics.

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Rich Barton
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  1. If the surface is flat, tape can be used to increase emissivity. Paper masking tape has an emissivity of approximately 0.95. Thin (40µm) polyimide tape (Kapton® tape) has an emissivity of approximately 0.90). After applying tape, create a region enclosing the tape and set the region emissivity to the appropriate value.
  2. If the surface is not flat or there are a number of structures with varying emissivity, an emissivity coating must be applied to increase surface emissivity. An emissivity table can then be created and applied to compensate for pixel-by-pixel emissivity differences.



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