介绍了红外傅里叶光谱仪干涉图的获 取原理和过程。基于MATLAB软件，首次采用将数值积分技术结合 离散傅里叶变换的方法对干涉图特性进行了建模和计算，得到了不 同温度黑体辐射所对应的干涉图，并对其直流偏置、最 大值以及相对最小值等特征进行了分析。定量给出了相对最小值与直流偏 置之间的线性关系，并从试验数据上对其进行了验证。在国内首次 从干涉图特性的角度分析了大气垂直探测仪系统的背景噪 声。然后对通过在CTIA型读出电路中引入减法电路来提高动态范围的 方法进行了可行性分析。结果表明，该方法并不具有可行性。

The interferogram acquisition principle and process of infrared Fourier spectrometers were presented. On the basis of MATLAB, modeling and calculation of the characteristics of interferograms were carried out by combining numerical integration with discrete Fourier transform for the first time. The interferograms corresponding to different temperature blackbody radiation were obtained and their direct component, maximum value and relative minimum value were analyzed. The linear relationship between the relative minimum value and the direct component was given quantitatively and was verified by comparing experimental data. The background noise of an atmospheric vertical detector system was analyzed in terms of the characteristics of interferograms for the first time in China. Then, the feasibility of using the subtraction circuit in CTIA to improve the dynamic range of the detector was analyzed. The result showed that the method was not feasible.