深海甲烷激光拉曼光谱原位探测器的研究

为了对深海痕量甲烷进行原位实时检测,研制出一种甲烷激光拉曼光谱探测器。介绍了拉曼散射的量子机理和拉曼光谱的特性,对合成甲烷水体进行了拉曼光谱测试,确定了水中甲烷的拉曼振动光谱范围在2 904~2 917 cm-1之间,且水分子的振动谱峰与甲烷的振动谱峰不重叠。利用这一特点可以设计甲烷激光拉曼光谱探测器,能原位、快速地分析和检测出海水中痕量甲烷组分,并通过耐压光纤将检测数据进行实时的远程传输,具有高灵敏度,适应4 000m深海高压低温环境作业的特点。

Research on laser Raman spectroscopic in situ sensor of methane in deep ocean

A kind of laser Raman spectroscopic sensor of Methane is designed to in situ and real-time detect the trace methane in the deep ocean.The quantum mechanics of Raman scattering and the characteristics of Raman spectroscopy are introduced.The Raman spectroscopy of synthesis methane solution is tested,the range of determining Raman vibration spectroscopy of methane in the water is 2904~2917cm-1 and Raman vibration peak of methane does not overlap with that of seawater.By using the feature,laser Raman spectroscopic sensor of methane can be designed,which can in situ and rapidly make analysis and trace detection of methane component in the seawater.In addition,the real-time measurement data can be remotely transmited through compression fiber.It possesses the characteristics of high sensitivity and adaptability at low-temperature and high-pressure environment in the 4000m deep ocean.