A novel single-camera approach to large-scale, three-dimensional particle tracking based on glare-point spacing
A novel single-camera approach to large-scale, three-dimensional particle tracking based on glare-point spacing
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DOI：
10.1007/s00348-021-03178-8
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发表时间：
2021-04
影响因子：
2.4
通讯作者：
J. Hou;F. Kaiser;A. Sciacchitano;D. Rival
中科院分区：
文献类型：
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作者：
J. Hou;F. Kaiser;A. Sciacchitano;D. Rival
本文提出了一种新的三维粒子跟踪测速方法，它可以用一台摄像机测量大体积的流动。流动是播种厘米大小的肥皂泡，当与适当的照明相结合，产生多个眩光点。然后利用每个气泡的两个最亮眩光点之间的间距来重建其深度。虽然大肥皂泡的使用是以非斯托克斯行为为代价的，但当与例如脉冲LED组耦合时，优秀的射线光学器件允许大体积照明。可能的误差来源和面外精度进行了讨论之前，该方法的可行性进行了测试，在一个工业规模的风洞设施（测试截面9.1米9.1米）。特别是，涡结构在一个30%比例的拖拉机拖车模型在ayaw角后被捕获在一个4.0 m1.5 m1.5 m的测量体积。通过单一视角在三维空间中提取多达80个时间步长的长轨迹。成功的概念验证证实了该新型方法在工业规模的三维测量中的潜力。图形摘要
AbstractA novel method for three-dimensional particle tracking velocimetry (PTV) is proposed that enables flow measurements in large volumes [m)] using a single camera. Flow is seeded with centimeter-sized soap bubbles, when combined with suitable illumination, produce multiple glare points. The spacing between the two brightest glare points for each bubble is then utilized to reconstruct its depth. While the use of large soap bubbles comes at the expense of non-Stokesian behaviour, the excellent ray optics allow for large volume illumination when coupled with for instance pulsed LED banks. Possible error sources and the out-of-plane accuracy are discussed before the feasibility of the method is tested in an industrial-scale wind tunnel facility (test section of cross section 9.1 m9.1 m). In particular, the vortical structure in the wake of a 30%-scale tractor-trailer model at ayaw angle is captured in a 4.0 m1.5 m1.5 m measurement volume. Long tracks of up to 80 time steps are extracted in three-dimensional space via a single perspective. The successful proof-of-concept confirms the potential of the novel approach for three-dimensional measurements in volumes of industrial scale.Graphic abstract