Remote sensing for the volcanic fluid by use of back scattering Raman light

我们进行了一个基本的实验，通过这个实验，自然水的酸度，如活火山的湖水。 激发光采用532nm 0.6W激光。 对于拉曼光的检测，使用单色仪和光电倍增管。 在实验室中，用激光激发不同酸度的水溶液，在30 cm的距离上观察到后向散射拉曼光。 在642和650 nm波长处检测到源于水分子振动的特征拉曼光。 这些峰的相对高度与溶液的酸度相关，暗示了基于拉曼光观测的水酸度遥感的可能性。

We carried out a basic experiment by which the acidity of natural water such as the lake water in active volcanoes. For the exciting light, 532nm 0.6W laser was employed. For the detection of Raman light, a monochrometer and a photomultiplier were used. In a laboratory, water solutions with various acidities were excited by the laser and the back scattering Raman light was observed with the distance of 30 cm. The characteristic Raman light originating in the vibration of H2O molecules were detected at 642 and 650 nm of wave length for the peak in spectra. The relative height of those peaks was correlated to the acidity of solution, implying the possibility of remote sensing of water acidity based on the Raman light observation.