Development of underwater monitoring techniques using Raman lidar for environment assessment of seafloor developments

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H05336
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Environmental impact assessment
• Research Institution: Institute for Laser Technology
• Principal Investigator: Somekawa Toshihiro 公益財団法人レーザー技術総合研究所, レーザープロセス研究チーム, 上席研究員 (00508442)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ラマン / ライダー / メタン

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.

Free Research Field

レーザー計測