From: Eric Walker 

 

This is a helpful analogy.  I was wondering why the emissivity of alumina was 
an issue.  I take it this sort of issue is resolved by coating the thing device 
being measured in a black refractory coating.

 

 

Exactamundo. Any undergrad engineering student could see that the alumina needs 
to be coated with a black refractory coating.

 

That these guys did not see this --- hmm, that does not inspire confidence.

 

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