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Emissivity of textured bed  

New Member
Emissivity of textured bed

Does anybody have a definitive value of the emissivity?  I am using an IR camera to check bed temperature, and using a value

of 0.76 the temperatures reported by the camera and the built in sensor seem to be close. The temperature distribution seems

pretty good but it would be nice to have more confidence on the actual temperatures.


Posted : 28/08/2021 11:05 am
Patrick McNamara
Estimable Member

Oxidized steel is going to have an emissivity around 0.8. Given the shinier surface of the powder coating, 0.76 doesn't seem out of bounds. I doubt you are going to get a definite answer though. Best you could do is to determine it experimentally, if you have access to a good thermocouple.

Posted : 08/09/2021 6:11 pm
Active Member

use a calibrated contact thermometer or temp. measuring device to confirm the actual temp of the surface, then adjust emissivity of the camera until it matches the temp. of the measuring device. This may be a good place to start. 

You should be most interested in the relative temp, if it always reads 245° when adhesion is great you just have to confirm that with the settings you have selected it reads 245°. 



Posted : 01/10/2021 12:43 am