In order to obtain the infrared spectral radiance distribution of the emission spectrum or the concentration of the gases, the calibration of FTIR emission system is necessary for obtaining an instrument response function of the system. This paper gives the effect of the temperature of the standard blackbody for calibration of EQUINOX55 remote sensing FTIR emission system on the instrument response function. The result illustrates that the values of the instrument response functions increase as the blackbody temperature increased, and tends to a limit.
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