Joenathan C, Khorana B M
Appl Opt. 1992 Apr 10;31(11):1863-70. doi: 10.1364/AO.31.001863.
This paper presents a detailed investigation of the effect of speckle averaging in electronic speckle-pattern interferometric fringes. The theory states that the constrast of the resultant smoothed fringes increases as the number of frames is increased. It is shown that the contrast of the fringes is optimized with a limited number of superpositions, and further addition results in the reduction of speckle noise with the contrast remaining almost the same. The contrast of the fringes obtained with pi and pi/2 phase-stepping methods with speckle averaging is also discussed. Both theoretical and experimental results are presented in this paper.
本文详细研究了散斑平均对电子散斑图案干涉条纹的影响。理论表明，随着帧数增加，所得平滑条纹的对比度会提高。结果表明，条纹对比度在有限数量的叠加下达到最优，进一步增加叠加次数会使散斑噪声降低，而对比度几乎保持不变。本文还讨论了采用散斑平均的π和π/2相移法所获得条纹的对比度。文中给出了理论和实验结果。
