基于高斯函数卷积的色散型拉曼光谱仪温度校正

色散型拉曼光谱仪易受到温度影响,使测得的光谱重复性变差。针对这个问题,本研究提出了基于高斯函数卷积的温度校正方法。利用标准物质获得光谱仪在不同温度下的仪器响应函数,并以此构造高斯函数,通过卷积运算对温度造成的波数漂移以及分辨率变化进行校正。本方法直接基于拉曼谱分析,机理性强,且无需测量大量样本。利用苯作标准物质,对间二甲苯与汽油样本的拉曼光谱进行温度校正。结果表明,本方法能有效去除温度对色散型拉曼光谱仪的影响,使得不同温度下测得的光谱一致性显著提高。

Correction of Temperature Effect on Dispersive Raman Spectrometer Based on Convolution with Gaussian Function

Dispersive Raman spectrometer is sensitive to the temperature of environment,which affects the consistency of measured spectra.To solve the problem,a method was proposd for correcting the temperature effect on instruments by applying convolution with a Gaussian function.A standard material was used to represent the instrumental response functions under various temperature conditions,then a Gaussian function for convolution was built,the problems of wave number drift and resolution variation were corrected.Based on spectral analysis and curve fitting,this method does not need to measure a set of well-prepared samples.Benzene was used as standard material in the experiment,and the temperature correction was performed on Raman spectra of m-xylene and a gasoline sample.Results show that it is an effective method to reduce temperature influence on dispersive Raman spectrometer,and the consistency of Raman spectra measured at different temperatures was greatly improved after correction.