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

2

917cm-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 char

acteristics of high sensitivity and adaptability at low-temperature and high-pressure environment in the 4000m deep ocean.