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Ergodic and non-ergodic regimes in temporal laser speckle imaging

机译:时间激光散斑成像中的ergodic和非遍历制度

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The non-ergodicity problem of temporal averaging in the laser speckle contrast imaging (LSCI) is discussed both theoretically and numerically. We demonstrate that temporal speckle statistics assessed within a finite time window might differ from the statistics of the speckle ensemble. The dependence of temporal speckle contrast on sample dynamics is non-monotonic and demonstrates regimes of negative (ergodic), as well as positive correlations with dynamics (non-ergodic). The ergodic regime is similar to an ensemble (spatial) averaging case and is typically assumed for interpretation of LSCI measurements. The positive relation in the non-ergodic regime is an artifact of temporal statistics which we further quantify and describe the transition between two regimes. (c) 2017 Optical Society of America
机译:理论上和数值讨论激光散斑对比度成像(LSCI)中的时间平均的非遍历性问题。 我们展示在有限时间窗口中评估的时间散斑统计数据可能与散斑集合的统计数据不同。 时间散斑对比度对样本动态的依赖性是非单调的,并表现出阴性(ergodic)的制度,以及与动力学(非ergodic)的正相关性。 ergodic制度类似于集合(空间)平均案例,并且通常假设用于解释LSCI测量。 非遍历制度中的正关系是我们进一步量化和描述了两个制度之间的过渡的时间统计的伪影。 (c)2017年光学学会

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