This paper proposes a theoretical method based on physical model to calculate infrared (IR) radiation spectrum. IR
physics establishes that emission abilities of objects are measured by emissivity, while the emissivity of objects is based
on the emissivity of a blackbody. Planck formula shows how to calculate the spectral energy density of a blackbody, and
IR radiation spectrum of a sample can be easily obtained if its emissivity is known. Kirchhoff's law shows the emissivity
of an object is equal to its absorptance at the same conditions. By calculating the absorption coefficient using line-by-line
model, the absorptance can be achieved through the relationship between them. The performance data of the technique is
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