横向位移双曝光散斑图维纳谱的信息分布

讨论了横向位移双曝光散斑图维纳谱的信息分布，并由此导出杨氏纹图的一般表达式。讨论了条纹可见度与应变，面内转动，照明光束直径与条纹图图空间坐标的关系，指出了在条纹可见度影响下最大可见条纹数目。还讨论了散斑衬比与衍射晕的关系。

Information Distribution of Wiener Spectrum of Double Exposure Specklegrams in Lateral Displacement Measurement Young''''s Fringe Patterns on Displacements and Speckle Contrast

In this paper, the information characteristics of the Wiener spectrum of adouble exposure specklegram have been discussed. As an example, the general expressionsof Young' s fringe patterns are obtained. We have analysed the fringe visibility and itsdependence on the nature of the deformation and displacement of the specinaen and on theextent of laser beam illuminated area on the specklegrams. The maximum number ofvisible fringes has been derived. Finally, diffraction halo brightness and it dependence onthe contrast of speckles have been given.