A new dynamic masking technique for time resolved PIV analysis
A new dynamic masking technique for time resolved PIV analysis
复制标题
用于时间分辨 PIV 分析的新动态掩蔽技术
作者：
Valentina Lombardi;M. Rocca;P. Prestininzi
时间分辨PIV包括与光源干扰的移动和/或变形对象，需要使用动态掩蔽(DM)。最近发展了一些DM技术，主要是在微流体和多相流领域。它们中的大多数需要对实验装置进行特别设计，并且可能会破坏所得到的PIV分析的准确性。这里提出了一种新的DM技术，该技术设想了一种专用的掩蔽算法，使用荧光涂层来允许对目标的准确跟踪。我们展示了通过验证的PIV设置获得的测量结果，展示了即使对于具有有限位移的对象，也需要包括DM步骤。我们将该算法与无掩蔽算法和静态掩蔽算法进行了比较。在开发低成本、灵活和准确的PIV设置的框架内，通过能够生成掩码的免费软件应用程序可以使用所提出的算法，该掩码可供现有的免费PIV分析包使用。
Time resolved PIV encompassing moving and/or deformable objects interfering with the light source requires the employment of dynamic masking (DM). A few DM techniques have been recently developed, mainly in microfluidics and multiphase flows fields. Most of them require ad-hoc design of the experimental setup, and may spoil the accuracy of the resulting PIV analysis. A new DM technique is here presented which envisages, along with a dedicated masking algorithm, the employment of fluorescent coating to allow for accurate tracking of the object. We show results from measurements obtained through a validated PIV setup demonstrating the need to include a DM step even for objects featuring limited displacements. We compare the proposed algorithm with both a no-masking and a static masking solution. In the framework of developing low cost, flexible and accurate PIV setups, the proposed algorithm is made available through a freeware application able to generate masks to be used by an existing, freeware PIV analysis package.