Replacement Particle Image Velocimetry (PIV) Laser

替代粒子图像测速 (PIV) 激光器

• 批准号: RTI-2019-00529
• 负责人: Hall, Joseph
• 金额: $ 3.54万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=652848
• 关键词: Replacement; Particle; Image; Velocimetry; PIV

Properly characterizing fluid flows requires accurate velocity measurements over the full flow field. A better understanding of the physics of the flow field is gained when we have simultaneous information about the flow at many points in space. Rapid advances in computing and digital imaging have facilitated the development of the Particle Image Velocimetry (PIV) measurement technique. To perform PIV, a flow is seeded with tiny particles (like smoke or mist) and illuminated using a powerful laser. Then, two successive images of the flow are captured using high speed cameras and compared using complex particle tracking algorithms. The end result is a full array of velocity vectors throughout the flow field.******UNB currently has a LaVision stereoscopic PIV system that is in good working order but the laser that illuminates the flow is old and no longer working properly. The manufacturer of our laser has been sold and are no longer making PIV lasers. Given that the cost of repairing the current laser is comparable to the cost of buying a new laser and given that some components of the laser are no longer being made, we believe that the best way forward is to purchase a new replacement laser so that we can again perform PIV. Thus, we are requesting funds for a replacement laser of comparable power to the old laser. The replacement laser has a shockproof design that does not require regular beam alignment; this means that the laser is safer to use than the current laser as the optical chamber of the laser does not need to be regularly opened. The shockproof design is particular suited for our research on accelerating flows. **

正确表征流体流动需要在整个流场上进行精确的速度测量。当我们同时获得空间中许多点的流动信息时，我们就能更好地理解流场的物理原理。计算和数字成像的快速进步促进了粒子图像测速（PIV）测量技术的发展。为了执行 PIV，需要在气流中注入微小颗粒（如烟雾或薄雾），并使用强大的激光进行照明。然后，使用高速摄像机捕获两个连续的流动图像，并使用复杂的粒子跟踪算法进行比较。最终结果是整个流场中的完整速度矢量阵列。********UNB 目前拥有 LaVision 立体 PIV 系统，该系统工作状态良好，但照亮流场的激光器已经过旧，不再正常工作。我们的激光器制造商已被出售，不再生产 PIV 激光器。鉴于维修当前激光器的成本与购买新激光器的成本相当，并且激光器的某些组件已不再生产，我们认为最好的方法是购买新的替换激光器，以便我们可以再次执行 PIV。因此，我们正在请求资金来更换功率与旧激光器相当的激光器。替换激光器具有防震设计，不需要定期进行光束对准；这意味着该激光器比当前的激光器使用起来更安全，因为激光器的光学室不需要定期打开。防震设计特别适合我们对加速流动的研究。 **