【摘要】 本文提出了三种新的散斑照相孔径方法:一维调频孔径法,交叉孔径法和旋转孔径法。给出了理论分析和实验证明。这些方法简单实用,能有效地改变衍射晕的能量分布。适当选择孔径的参数,实验者能相当任意地控制散斑图的空间频率成份。新方法兼顾了突出某一频率成份、灵敏度连续可调、获得多个方向散斑场运动信息等各方面的特性。更多还原

【Abstract】 Three new aperture methods of speckle photography,one dimensional frequency modulated aperture method crossed aperture method and rotation aperture method are proposed.The theoretical analysis and experimental demonstration are presented.The methods are simple to apply.The intensity distribution of the diffraction halo is modulated effectively with the methods.Selecting proper parameters,the experimenter can control the spatial frequency content of a specklegrarn arbitrarily to a certain extent.The new methods possess several desired functions,they are sticking out a band of spatial frequency,chosing sensitivity continuously and selecting information of displacement in any direction.更多还原