一种用多色光作为激发源产生拉曼光谱的新算法

A New Algorithm for Generating Raman Spectra Using Polychromatic Light Sources

探讨用多色光代替激光作为拉曼光源的新型拉曼光谱仪的可能性。根据拉曼光谱原理,并通过数学分析,发现当用多色光照射在样品上时,所得到的散射光经散射频率校正后在不同频率上的强度分布可以写成样品的Raman-Rayleigh联合散射谱和激发光光源的功率谱的卷积。利用傅里叶变换算法,有可能从多色光照射样品所得到的散射光谱中导出样品的拉曼光谱。基于上述原理,可能发展出不用激光的新一代拉曼光谱仪。

In the present paper, the possibility of generation of Raman spectra using polychromatic light instead of laser is diseussed based on the theory of Raman scattering. When a polyehromatic light impinges on a sample, the resultant scattering includes Rayleigh scattering and Raman scattering brought about by the excitation light at each corresponding frequency. Mathematical analysis demonstrates that the scattering spectra after being corrected by the frequency of scattered light are the convolution of Raman-Rayleigh jointed spectrum and the power spectrum of the excitation light. Therefore, Raman spectrum can be obtained with an algorithm of Fourier transformation using polyehromatic light as an excitation source.