【摘要】 针对傅里叶变换红外光谱仪(FTIR)在长时间开放光程条件下进行测量时光谱基线的漂移,采用多项式迭代拟合逼近的方法,针对3种不同类型的基线漂移光谱进行校正,分别在MATLAB环境下及DSP中实现,校正后的光谱数据采用均方根误差R作为评价标准,分别达到了4.21×10-6和5.38×10-6,校正时间分别消耗0.935 0 s和0.778 3 s,结果表明该方法自动化程度高,校正效果好,速度快,可以为基于DSP实现系统小型化、集成化的光谱处理系统提供理论基础。更多还原

【Abstract】 Fourier transform infrared spectroscopy(FTIR) measurements in the long open-path conditions,FTIR spectra baseline will drift to influence the spectral information,changing the spectral shape and affect the accuracy of gas analysis.Therefore,the baseline correction of the measured spectral information is very important preprocessing step,providing a good data base for the next gas qualitative and quantitative analysis.For baseline drift using the approximation method of polynomial iterative fitting spectra of three different types of baseline drift correction,respectively under MATLAB and DSP enviroment.After correction for the spectral data to evaluate the root mean square error(R) respectively to 4.21×10-6 and 5.38×10-6,the correction time consumption are 0.935 0 s and 0.778 3 s.The results show that the method owns advantages of high degree of automation,the correction effect and high calculating speed,providing a theoretical basis for the miniaturization of integrated spectral processing system based on DSP.更多还原