| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2015: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Outline of Final Research Achievements |
We have examined the applicability of Raman lidar technique as a laser remote sensing tool in water. In order to verify our approaches to submarine lidar applications, we apply our method to monitor CH4 gas discharged from Taketomi submarine hot spring. Taketomi submarine hot spring is located at southern part of Yaeyama archipelago, where CH4 gas is discharged from sea bottom at water depth of 20 m. We demonstrated Raman spectroscopy of CH4 gas in water using UV laser. Also, the effect of seawater on CH4 Raman spectra has been evaluated. We developed the marine Raman lidar system capable of detecting the Raman lidar signals and spectrum on a boat and conducted the Raman lidar experiment at Taketomi submarine hot spring. The results show that our technique can be applied to efficient underwater monitoring.
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