Abstract

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.

Graphic abstract

中文翻译：

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一种用于时间分辨PIV分析的新动态掩膜技术

摘要

包含移动物体和/或可变形物体干扰光源的时间分辨PIV需要使用动态遮罩（DM）。最近已经开发了一些DM技术，主要是在微流体和多相流领域。它们中的大多数都需要实验设置的临时设计，并且可能会破坏所得PIV分析的准确性。这里介绍了一种新的DM技术，该技术设想了一种专用的掩膜算法，并采用了荧光涂层来精确跟踪物体。我们显示了通过经过验证的PIV设置获得的测量结果，表明即使对于位移有限的物体，也需要包括DM步骤。我们将所提出的算法与无掩膜和静态掩膜解决方案进行了比较。在发展低成本的框架下，

图形摘要