Development of photoelectric optical fiber probe and expression of micro-bubble function

微泡因其在科学和技术上的巨大扩展潜力而引起了人们的极大关注。传统的测量技术如PDA(相位多普勒风速仪)、ILDS(干涉激光成像测量液滴大小)等不足以揭示它们的相互作用和有用的特性。在微气泡的数密度很高的情况下，常规的测量技术是不可行的。为了攻克这一难题，开创多相流研究的新领域，头部探测者在其微型光纤探头研究成果的基础上，提出了一种新的测量系统。我们最新研制的多功能光电光纤探头可以同时测量气泡/液滴的直径、速度、数密度和物质的浓度。研究结果如下：1)利用光信号和电信号同时测量微气泡/液滴的直径、速度、数密度和表面电势，并测量其表面张力。2)建立了飞秒脉冲激光微细加工石英的实验系统。3)阐明了微气泡/液滴的动力学性质变化以及微气泡/液滴与周围相相互作用随函数表达的变化。4)获得了微小光纤微细加工的基础数据，建立了微细光纤的微细加工技术。三年的研究成果如下：1)30篇论文(4篇在日本期刊上发表，24篇在国际期刊上发表)，2)24篇国际会议论文3)17场特邀主题演讲(国际会议)4)24场特邀主旨演讲(国内会议)5)3项专利申请(2项专利申请日本，1项专利申请国外)

Micro bubbles attract a great deal of attention due to their large potential for expansion in both science and technology. Conventional measurement techniques such as PDA (Phase Doppler Anemometer), ILIDS (Interferometric laser imaging for droplet sizing) and so on are insufficient to reveal their interting and useful properties. In the case of high number density of the micro bubbles, the conventional measurement techniques are not available. For the purpose of overcoming the difficult problem and pioneering an innovative field in multiphase flows, the head invastigator proposes a new measurement system based on his research results of micro optical fiber probe. We newly developed the multifunctional photoelectric fiber probe that simultaneously measures the diameter, velocity and number density of bubble/droplet and the concentration of substances. The outline of the results as follows;1) By simultaneously using optical signals and electric signals, we established the new measurement system that measures the diameter, velocity, number density and surface potential of the micro bubbles/droplets, as well as measurement of the surface tension.2) We established micro fabrication of quartz by femtosecond pulse lasers.3) We elucidated the change of dynamical properties of micro bubbles/droplets and the changes of interaction between them and the surrounding phase owing to expression of function. We obtained the data for application in material production.4) We obtained basic data for micro fabrication of tiny optical fibers and established the techniques for the micro fabrication.The products during the three-year study period are listed below:1) 30 papers (4 papers in Japanese journals and 24 papers in international journals),2) 24 papers in international conferences3) 17 invited keynote lectures (international conferences)4) 24 invited keynote lectures (domestic conferences)5) 3 patent applications (2 patents applied to Japan and 1 patent applied to oversea countries)