Salinity measurements by using a refractive-index sensor with an optical frequency comb

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13571
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: KAYUKAWA Yohei 国立研究開発法人産業技術総合研究所, 工学計測標準研究部門, 主任研究員 (50371034)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: レーザー計測 / 海洋科学 / センサ / 超精密計測 / 光周波数コム / 屈折率 / 海水 / 塩分

Outline of Final Research Achievements

Measuring the absolute salinity of sea water is important to understand the mechanism of oceans. In order to develop a new abosolute-alinity sensing device with refractive index measurement which can be used under water, a precise refractive index measurement technique was developed in this study. The measurement principle is based on spectral a method known as an interference displacement sensor. Interference fringes from the difference between the optical length of a pure water and a sea water cell was observed as a interference spectrum by a optical spectrum analyzer. In the present study,　it　was　shown　that　the　refractive　index　can　be　measured　precisely　by　employing　an optical frequency comb which has a broad range of optical frequency from 420 nm to 2 um.

Free Research Field

流体熱物性、精密計測