Measurement volume defined by peak-finding algorithms in cross-correlation particle image velocimetry
Measurement volume defined by peak-finding algorithms in cross-correlation particle image velocimetry
复制标题
互相关粒子图像测速中寻峰算法定义的测量体积
DOI：
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复制
发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Adrian
中科院分区：
文献类型：
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作者：
M. Olsen;R. Adrian
本文提出了一个分析模型，该模型将光片照明的互相关粒子图像测速仪中的峰值发现的位移与流体速度场的加权体积平均联系起来。推导了描述薄片PIV互相关函数的一般方程。通过将粒子图像近似为高斯，得到了光片照明的近似模型。这产生了可用于定义测量体积并找出针对该体积测量的速度的偏差的加权函数。
This note presents an analytical model that relates the displacement found by peak finding in cross-correlation particle image velocimetry using light-sheet illumination to the weighted volume average of the fluid velocity field. General equations are derived describing the cross-correlation function in light-sheet PIV. An approximate model is derived for light-sheet illumination by approximating the particle images as Gaussian. This results in a weighting function that can be used to define the measurement volume and to find biasing of the velocity measured for this volume.