【摘要】 文章构建并讨论了一个气体瑞利布里渊散射(RBS)的频谱分析模型。公认的S6和S7模型只具有数值形式,在实际应用中处理起来很复杂;而简单的高斯模型不够精确,容易造成较大的误差。针对以上问题,一种基于谱线展宽理论和Voigt线型理论的新模型(V3模型)被提出。该模型具有解析形式,处理起来很容易,并且能够较好地符合S7模型得到的瑞利布里渊散射的频谱。另外,这种模型能够将混在一起的瑞利和布里渊线型分开。仿真结果证明,测得的布里渊频移与理论值是匹配的。更多还原

【Abstract】 Analytical model for Rayleigh Brillouin scattering(RBS) spectra of gases is developed and discussed in this paper. The well-recognized S6 and S7 models only have numerical form and are complex to process in real applications; simple Gaussian models are imprecise and suffer from greater error. A new model(V3) based on spectral line broadening theory and Voigt profile is established. This model is easy to process as it has an analytical form, and is proved to have good accordance with S7 model. In addition, this model can separate Rayleigh and Brillouin line, the measured Brillouin shift is proved to match with theoretical values.更多还原