红外傅里叶光谱仪的干涉图模型研究及应用  

Study and Application of Interferogram Model of Infrared Fourier Transform Spectrometer

作　　者：李振宇[1,2,3] 张磊 杨敏珠[1,2,3] 韩昌佩[2,3] 

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院上海技术物理研究所,上海200083 [3]中国科学院红外探测与成像技术重点实验室,上海200083

出　　处：《红外》2017年第6期13-18,29,共7页Infrared

摘　　要：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.

关 键 词：红外傅里叶光谱仪 干涉图模型 直流偏置 背景噪声 

分 类 号：TH744.1[机械工程—光学工程]