Development of Laser Scan Lighting System for Flow Visualization

流可视化激光扫描照明系统的开发

• 批准号: 01850117
• 负责人: SAWAMOTO Masaki
• 金额: $ 2.56万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B).
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850117/
• 关键词: Flow Visualization; Laser Scan; Image Processing; レ-ザスキャン

The purposes of this research are to develop a new lighting system satisfying following items and to develop a image processing algorism in order to obtain a set of quantitative data from a flow visualization technique for high speed phenomena such as a wave breaking ;1) to obtain a bright laser sheet lighting system by scanning a laser beam,2) the laser sheet is parallel and uniform,3) time lines are also recorded by pulsating the laser beam,4) spacial scale is able to record in a image, and5) the system has a good handling capacity.The development of lighting system was performed successfully. But an additional modification of system needed because of noise from a laser beam scanner. Two kinds of system were tested ; one is introducing a optical fiber to transfer a laser beam and the other is without a fiber. It was confirmed that the former system has a room to modify to make light loss small but the later system satisfy the requirement of the researchers in fluid mechanics.In developing a image processing technique, a new algorism was programmed to track tracers in a visualized image. The algorism was applied to an analysis of wave breaking and was confirmed that it gives a good result in estimating not only a flow field but also a vortisity field and two dimensional divergence.

本研究的目的是开发一种新的照明系统，满足以下项目，并开发一种图像处理算法，以便从诸如波浪破碎的高速现象的流动可视化技术中获得一组定量数据; 1）通过激光束扫描获得明亮的激光片照明系统; 2）激光片平行均匀，3）时间线也是通过脉冲激光束记录的，4）空间尺度可以记录在图像中，5）系统具有良好的处理能力。但是由于激光束扫描器的噪声，需要对系统进行额外的修改。对两种系统进行了实验，一种是引入光纤传输激光束，另一种是不引入光纤。实验结果表明，前一种系统在减小光损失方面有一定的改进余地，而后一种系统可以满足流体力学研究人员的要求。在图像处理技术的发展方面，提出了一种新的算法，实现了对示踪剂的可视化跟踪。将该算法应用于波浪破碎的分析中，证实了该算法不仅能很好地估计流场，而且能很好地估计涡量场和二维散度。

项目成果

片岡 暁彦: "トレ-サ追跡法を用いた巻き砕波の内部流速場測定" 土木学会平成2年度東北支部技術研究発表会講演概要. 198-199 (1991)

Akihiko Kataoka：“使用示踪剂跟踪方法测量蜿蜒波的内部流速场”1990 年东北分会技术研究报告演讲摘要，日本土木工程师学会 198-199（1991）。

Sato, E.: "Development of Lase Scan Lighting System for Flow Visualization" Proc. Annual Meeting, JSCE. II. (1991)

Sato, E.：“用于流可视化的激光扫描照明系统的开发”Proc。

片岡 暁彦: "トレ-サ追跡法を用いた巻き砕波の内部流速場測定" 土木学会平成2年度東北支部技術発表会講演概要. 198-199 (1991)

Akihiko Kataoka：“使用示踪剂跟踪方法测量缠绕波的内部流速场”日本土木工程师学会 1990 年东北分会技术演示会议摘要 198-199（1991）。

片岡 暁彦: "注入トレ-サ法を用いた巻き砕波内部の流速場測定に関する実験的研究" 土木学会年次学術講演会,講演概要集第2部. 744-745 (1990)

Akihiko Kataoka：“使用注射示踪法测量蜿蜒波内流速场的实验研究”日本土木工程师学会年度学术会议，演讲摘要第2部分。744-745（1990）

Kataoka, A.: "Measurement of Flow Field in Plunging Breaker by Tracer Injection Method" Proc. Annual Meeting, JSCE. II-346. 744-745 (1990)

Kataoka, A.：“通过示踪剂注入法测量插入式破碎机的流场”Proc。