傅里叶变换红外光谱仪量化误差仿真分析  

Computer simulation analysis of quantization error of Fourier spectrometer

作　　者：袁钱图 邵丽萍 白忠臣 YUAN Qiantu;SHAO Liping;BAI Zhongchen(College of Medicine,Guizhou University,Guiyang 550025,China;College of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学医学院,贵阳550025 [2]贵州大学大数据与信息工程学院,贵阳550025

出　　处：《智能计算机与应用》2019年第5期111-114,120,共5页Intelligent Computer and Applications

基　　金：贵州省科技支撑计划(SY[2017]2887);中央引导地方科技发展专项，中科引地(20174004);国家自然科学基金-地区项目(61865002);贵州省MEMS传感器及系统应用科技创新人才团队，黔科合平台人才([2018]5616)

摘　　要：分析了数模转换器的量化误差对傅里叶变换红外光谱精度的影响。采用积分转离散求和的方法对干涉图进行建模仿真分析。将干涉图信号经过8位、12位、16位以及20位数模转换器转换之后进行快速傅里叶变换,最后解谱光谱数据。同时,也定量比较了不同位数的数模转换器的光谱图相较于原始光谱图的偏离程度,以及在吸收峰位置分析量化误差对光谱图偏移的影响。结果表明,20位数模转换器的平均偏离误差为1.884 97,且该模型可作为由量化误差引起相关误差的修正算法的理论依据。The influence of quantization error on infrared spectral accuracy of Fourier transform is analyzed.The method of integral to discrete summation is used to model and simulate the interferogram.The interferogram signal is subjected to fast Fourier transform after converted by digital-to-analog converters with 8 bit,12 bit,16 bit,and 20 bit,and the spectrum data is decoded.At the same time,the deviation degree between the spectrum diagram of the digital-to-analog converter with different bits and the original spectrum is quantitatively compared,and the influence of quantitative error for the spectrum migration is analyzed at the position of the absorption peak.The result shows that the average deviation error of the 20 bit digital-to-analog converter is 1.884 97,and the model can be used as the theoretical basis on the correction algorithm of correlation error caused by quantization error.

关 键 词：傅里叶变换光谱仪 红外吸收光谱 量化误差 迈克尔逊干涉仪 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]