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In this paper a comparative study is presented to assess the uncertainty of two methods for 3C3D velocimetry in microscopic flows: stereoscopic micro-particle image velocimetry (S-μPIV) and wavefront-deformation, or astigmatism, micro-particle tracking velocimetry (WD-μPTV). First, the main parameters affecting both methods’ measurement uncertainty are identified, described and quantified. Second, the test case of flow over a backward-facing step is analyzed using both methods. For comparison standard 2D-2C μPIV measurements and numerical flow simulations are shown as well. Advantages and disadvantages of both methods are discussed.

 仪器简介：
        在内燃机引擎，透平机械或泵体中进行PIV测量通常需要设计加工昂贵带有光学透明窗口或全光学玻璃模型。采用相机内窥镜或激光内窥镜可以在只开尺寸很小的通光孔径。先进的DaVis软件平台，集成了对较大光学成像畸变进行自动校正计算功能。LaVision提供的专门用于包括PIV测量应用的相机和激光内窥镜，通光波段涵盖可见光和紫外光波段。紫外光波段可以应用于燃烧和流动现象中的激光诱导荧光测量系统中。内窥式测量大大降低了对被测对象的机械改动和加工的工作量和时间以及投资成本。