消除散斑杨氏条纹图中衍射晕影响的新方法

A New Method Eliminating the Influence of Diffraction Halo in Speckle Young's Fringes

提出了杨氏条纹观察屏处放置衍射晕负片消除衍射晕影响的新方法。用该方法对实际双曝光散斑底片进行了处理。结果表明．对解决由于衍射晕强度变化引起的条纹极值漂移和条纹对比度下降问题行之有效。

A new method,that can eliminate the influence of non-uniform intensity distribu tion halo and enhance the computing accuracy,is proposed in this paper. This new method eliminate the influence of the diffraction halo by placing a negative film in the viewing screen. The principle of this method is described. It is employed to process the practical double-exposure speckle photographs. It is proved that this method is very effective in the respects:to eliminate the influence of the diffraction halo;to solve the problem such as fringe maximum and the decrease of fringe visibility caused by the variation of the diffraction halo irradiation.