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        The curve shown below can be used as a quick reference to estimate the amount of infrared radiant energy emitted from a given source. The curves were derived using the Stefan-Boltzmann Law. For example, a 1000 °F (538 °C or 811 K) infrared source with an emissivity value of .80 (80%) will have an approximate radiant emission (from the curves below) of 12.5 Watt / in². Using the Stefan-Boltzmann equation yields the following:

R = ( .80 )( 36.58072 x 10 ^-12 )[ (811)⁴] = 12.65 Watts / in²

Surface Temperature vs. Radiation Emission
at Various Emissivity Values

Watts / in²

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