孙鹤泉, 沈永明, 王永学, 康海贵, 李广伟. PIV技术的几种实现方法[J]. 水科学进展, 2004, 15(1): 105-108.
引用本文: 孙鹤泉, 沈永明, 王永学, 康海贵, 李广伟. PIV技术的几种实现方法[J]. 水科学进展, 2004, 15(1): 105-108.
SUN He-quan, SHEN Yong-ming, WANG Yong-xue, KANG Hai-gui, LI Guang-wei. Introduction of algorithms used in PIV technique[J]. Advances in Water Science, 2004, 15(1): 105-108.
Citation: SUN He-quan, SHEN Yong-ming, WANG Yong-xue, KANG Hai-gui, LI Guang-wei. Introduction of algorithms used in PIV technique[J]. Advances in Water Science, 2004, 15(1): 105-108.

PIV技术的几种实现方法

Introduction of algorithms used in PIV technique

  • 摘要: PIV技术是一种基于流场图像互相关分析的二维流场非接触式测试技术。在介绍利用Fourier变换的互相关特性及其快速算法实现PIV技术的基础上,介绍了可提高分析效率的实序列Fourier变换的实现方法,并进而提出了一种更高效的基于Hartley变换的分析法,给出了分离式内核的Hartley变换互相关特性的明确表达式。从算法复杂性理论与实际分析时间两方面对3种方法进行的比较,充分说明了Hartley变换在PIV技术应用中的优越性。

     

    Abstract: The particle image velocimetry (PIV) is an effective and non-intrusive technique to measure the planar distribution of velocity in the fluid based on the cross-correlation of flow images.In general,cross-correlation analysis in the PIV can be implemented quickly by the fast Fourier transform,and the efficiency can be improved by considering the property of real Fourier transform.Furthermore,the higher efficiency can be obtained by using the Hartley transform of separable kernels.Three algorithms are specified in detail in the paper,and the comparison of the three algorithms is conducted in the theory and computation time in practice,which can show the advantages of the Hartley transform.

     

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