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arXiv 1005.2875physics.optics
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laser散斑相关成像技术中的噪声

Noise in laser speckle correlation and imaging techniques

Sergey E. Skipetrov, Joern Peuser, Roberto Cerbino, Pavel Zakharov, Bruno Weber, Frank Scheffold

摘要:

我们研究了噪声的强度方差和强度相关性和结构函数测量的光散射从随机介质中的情况下,当这些数量是通过平均超过一个有限数量N的像素的数码相机。我们表明,在所有情况下,噪声尺度为1/N,它是敏感的信号对应于相邻像素的相关性,以及有效的时间平均(由于有限的采样时间)和空间平均(由于有限的像素大小)。这些结果对多散斑动态光散射、时间分辨相关光谱、散斑可见度光谱、激光散斑成像等应用中的噪声水平估计具有指导意义。

英文摘要:

We study the noise of the intensity variance and of the intensity correlation and structure functions measured in light scattering from a random medium in the case when these quantities are obtained by averaging over a finite number N of pixels of a digital camera. We show that the noise scales as 1/N in all cases and that it is sensitive to correlations of signals corresponding to adjacent pixels as well as to the effective time averaging (due to the finite sampling time) and spatial averaging (due to the finite pixel size). Our results provide a guide to estimation of noise level in such applications as the multi-speckle dynamic light scattering, time-resolved correlation spectroscopy, speckle visibility spectroscopy, laser speckle imaging etc.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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