【摘要】 根据经典电磁理论和量子理论分析了拉曼光谱技术,探讨了共振拉曼效应对提高散射光强所起的作用.采用LRS-III型激光拉曼光谱仪对甲烷水溶液进行了拉曼检测实验,实验结果验证了水中甲烷拉曼检测的可行性.根据液芯光纤传光原理分析了输出拉曼光功率与损耗系数和光纤长度的关系,利用LabVIEW软件对液芯光纤的拉曼增益作用进行了仿真,仿真结果表明液芯光纤可提高拉曼光强达103倍.针对水中甲烷含量比较低的特点,提出基于液芯光纤并共振拉曼效应的方法,可提高拉曼光强接近109倍.更多还原

【Abstract】 Raman spectroscopy technology was analyzed based on classical electromagnetic theory and quantum theory,improvement of spectral intensity with resonance Raman effect was discussed.The Raman detection of methane in water had been done using the LRS-III Raman spectrometer,the experimental result showed that Raman detection of methane in water was feasible.Based on the optics transmission principle of liquid core optical’s fiber,the relationship between the Raman optical output power and loss coefficient,fiber length was discussed.The simulation of liquid core optical fiber Raman gain was finished by the software LabVIEW,the result showed that Raman intensity increased 103 times by liquid core optical’s fiber.In terms of the low methane in water,the method of liquid core optical fiber and resonance Raman effect was proposed,Raman intensity can increase by nearly 109 times.更多还原