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Non contact thermometer emissivity correction

PostPosted: Sun Dec 24, 2017 6:17 am
by kingofnobbys

All cheaper non-contact thermometers are set to an given emissivity value , generally e = 0.9 or there abouts. This is OK for measure the temperature of enabled oven surfaces and bakeware. but not so flash for bits of bark, branches, bits of rock, bedding, and water.

There are tables of emissivities for different material surfaces available online, I personally refer to my Perry's Chem Engr's HB and my Furnace Engineering Reference books and my CRC HB of Physics & Chemistry.
This table is handy too , ... NG_A_W.PDF

To get the correct temperature when the emissivity is set poorly this is how you correct for the emissivity : ... ection.pdf,