高精度FTIR数据处理方法研究

FTIR Data Processing Method of High-precision

为了实现对红外光谱的准确测量,对切趾、相位校正、波数校正等方法进行研究,建立了高精度的傅里叶红外光谱仪数据处理系统。在比较各种窗函数的优缺点的情况下选用四阶布莱克曼窗函数对干涉图进行切趾,根据红外光干涉图相位误差特点采用卷积法对单边干涉图进行相位校正,深入研究波数校正方法,采用能量重心法进行波数校正。实验结果表明,傅里叶红外光谱仪数据处理方法能有效的实现光谱的准确测量,在波数重叠非常严重的条件下波数精度能提高5～10倍,在波数重叠不严重的条件下波数精度能提高103倍以上。四阶布莱克曼窗函数能有效减少有限截取的能量损失,卷积法相位校正能很好的校正相位误差,能量重心法能够对谱峰进行精确定位,高精度FTIR数据处理方法能实现对红外光谱的高精度测量。

In order to measure the infrared spectrum accurately,a high-precision Fourier Transform Infrared spectroscopy（FTIR）data processing system has been established.Some methods,such as apodization,phase correction,and wave number correction were researched.Compared with the two sides of window functions,Fourth-order Blackman window function was used for apodization of the interferogram,using convolution of unilateral interferometers for phase correction according to the characteristics of infrared interferometers phase error,further researched the number of wave energy calibration method of gravity wave number correction.Experimental results show that the spectra can be accurately measured by the Fourier transform infrared spectroscopy data processing system,and the accuracy of the wave number can increase 5 to 10 times under the condition of the wave number overlaps seriously,and the parameter would improve more than 103 times when the overlapping condition of the wave number is not serious.The Fourier transform infrared spectroscopy data processing system could meet the challenge of accurate measurement of the infrared spectrum.