Development of high resolution measurement of a thin liquid film on the basis of femtosecond frequency domain interferometry OCT

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13866
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Shizuoka University
• Principal Investigator: SAITO Takayuki 静岡大学, グリーン科学技術研究所, 教授 (10324328)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 流体工学 / 混相流 / 液膜 / スペクトル干渉 / フェムト秒レーザーパルス / 時間分解計測 / 時間分解照射 / 吸収分光計測

Outline of Final Research Achievements

Making the best use of extraordinary characteristics (i.e. ultra-short pulse duration, strong coherency, ultra-high energy density, multi-photon absorption and wide band) of a femtosecond laser pulse (FSLP), a new principle of measurement of a thin water film formed on a stator vane of steam turbine. First, the FSLP was split into two laser pulses with an ultra-small interval from several-hundred femtoseconds to several picoseconds. Second, the first pulse was used as a priority pulse that is absorbed by the water molecules in the optical path, and the second pulse was used as a sensing pulse. Thus, a new principle based on the interference intensity of this sensing pulse was developed to accurately measure a thin water film.

Free Research Field

流体工学