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Emissivity’s dependence on thickness?

Question asked by Jerry Pham on Jul 1, 2013
Latest reply on Jul 1, 2013 by Jared Conway

Hello,

 

The tutorial “150W Halogen Floodlight” example uses Emissivity Coefficient:

emissivity.jpg

but there is a question on the exact definition for this: it ϵ thickness-dependent?

According to http://en.wikipedia.org/wiki/Emissivity:

Although it is common to discuss the "emissivity of a material" (such as the emissivity of highly polished silver), the emissivity of a material does in general depend on its thickness. The emissivities quoted for materials are for samples of infinite thickness (which, in practice, means samples which are optically thick) — thinner samples of material will have reduced emissivity.

Most emissivities found in handbooks and on websites of many infrared imaging and temperature sensor companies are the type discussed here, total emissivity. However, the distinction needs to be made that the wavelength-dependent or spectral emissivity is the more significant parameter to be used when one is seeking an emissivity correction for a temperature measurement device.

 

I wonder in doing the calculations, does Solidworks make any adjustment according to the actual thickness of a surface?

 

 

Jerry

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