In situ calibrated defocusing PTV for wall-bounded measurement volumes
In situ calibrated defocusing PTV for wall-bounded measurement volumes
复制标题
用于壁限测量体积的原位校准散焦 PTV
DOI：
10.1088/0957-0233/27/8/084005
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
Kähler CJ
中科院分区：
文献类型：
--
作者：
Fuchs T;Hain R;Kähler CJ
在许多情况下，薄（∼ 1 mm）但宽（∼ 100×100 mm 2）流道中的 3D 速度测量是一项重要任务。为了正确解析面内和面外速度梯度，需要精确校准，因为 3D 测量方法强烈依赖于校准程序的准确性。由于其尺寸，校准目标很可能不适合深度较小的域。此外，在对此类测量感兴趣的领域中，测量体积的可访问性通常是有限的甚至是不可能的。为了克服这些缺点，本文介绍了一种原位校准的散焦粒子跟踪测速方法，适用于深度在低毫米范围内的壁限测量域。粒子深度位置的校准函数直接从粒子图像几何形状及其两帧之间的位移导出。这种散焦方法仅采用单个相机，能够测量距离为 1 毫米的两个平行玻璃板之间的气流，相对于最大速度，每个轨迹的平均不确定度为 2.43%。作为单相机技术基准的断层粒子跟踪测速测量达到了 1.59% 的平均不确定度。总之，由于其简单的设置并且不需要校准目标，这种原位校准散焦方法开辟了光流测速的新应用领域。特别是对于具有小光学窗口且缺乏可访问性的测量域。
In many situations, 3D velocity measurements in thin (∼ 1 mm) but wide (∼ 100× 100 mm 2) flow channels is an important task. To resolve the in-plane and out-of-plane velocity gradients properly, a precise calibration is required, since 3D measurement approaches rely strongly on the accuracy of the calibration procedure. It is likely that calibration targets do not fit domains with small depths, due to their size. Furthermore, in fields where such measurements are of interest, the accessibility of the measurement volume is often limited or even impossible. To overcome these drawbacks, this paper introduces an in situ calibrated defocusing particle tracking velocimetry approach for wall-bounded measurement domains with depths in the low millimeter range. The calibration function for the particle depth location is directly derived from the particle image geometries and their displacements between two frames. Employing only a single camera, this defocusing approach is capable of measuring the air flow between two parallel glass plates at a distance of 1 mm with an average uncertainty of 2.43% for each track, relative to the maximum velocity. A tomographic particle tracking velocimetry measurement, serving as a benchmark for the single camera technique, reaches an average uncertainty of 1.59%. Altogether, with its straightforward set-up and without requiring a calibration target, this in situ calibrated defocusing approach opens new areas of application for optical flow velocimetry. In particular, for measurement domains with small optical windows and a lack of accessibility.
五种不同PIV询问算法的比较研究
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
M. Piirto;H. Eloranta;P. Saarenrinne;R. Karvinen
通讯作者：
R. Karvinen
DOI：
--
发表时间：
1974
期刊：
影响因子：
--
作者：
M. A. Karnitz;M. Potter;M. Smith
通讯作者：
M. Smith