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本文依据时变散斑的统计性质,研究了一种新的二维速度矢量的测量技术。推导出远场时变散斑振幅涨落及光强涨落的空-时相关函数,它们完整地描述了远场时变散斑的统计性质。利用远场时变散斑空-时强度相关函致的有限差商可以测量散射体运动的二维速度矢量。文中给出了这种技术的理论及计算机仿真分析的结果。
In this paper, based on the statistical properties of time-varying speckle, a new two-dimensional velocity vector measurement technique is studied. The space-time correlation function of amplitude fluctuation and intensity fluctuation of the far-field speckle is deduced. They completely describe the statistical properties of the far-field time-varying speckle. Using the finite difference operator of the far-field time-varying speckle space-time intensity correlation function, two-dimensional velocity vectors of scatterers can be measured. The paper gives the theory of this technology and the results of computer simulation analysis.