斑点状的
Speckled speckled speckle
摘要：
散斑是当相干光从粗糙表面反射时看到的辐照度的空间波动。这是由于从表面的许多角落和裂缝反射的光在到达观测点的途中积累了巨大的差异时间延迟，跨越的时间远远超过一个光学周期。虽然连续波（cw）照明的散斑被很好地理解，但是对使用相干光的非视线（NLoS）成像的新兴兴趣已经产生了理解由多次粗糙表面反射产生的高阶散斑的需要，即，斑点斑点和斑点。此外，最近引入的相量场（$\mathcal{P}$ -field）NLoS成像--依赖于幅度调制相干照明--需要推动超越连续波场景的散斑和高阶散斑。在本文中，我们采取的第一步，在解决上述需求，使用三漫射透射几何形状，这是一个代理三反弹NLoS成像。在小扩散器的限制，我们表明，连续波和调制$n$第七阶散斑的辐照度方差一致，是普通（一阶）散斑的$(2^n-1)$倍。然而，NLoS成像的更重要的情况涉及扩展的漫反射器。对于我们的扩展漫射器透射几何，我们处理三阶连续散斑和一阶调制散斑。我们的研究结果表明，散斑是不太可能阻碍成功操作的相干照明连续波成像仪，他们建议，同样可能是真实的$\mathcal{P}$场成像仪。
英文摘要：
Speckle is the spatial fluctuation of irradiance seen when coherent light is reflected from a rough surface. It is due to light reflected from the surface's many nooks and crannies accumulating vastly-discrepant time delays, spanning much more than an optical period, en route to an observation point. Although speckle with continuous-wave (cw) illumination is well understood, the emerging interest in non-line-of-sight (NLoS) imaging using coherent light has created the need to understand the higher-order speckle that results from multiple rough-surface reflections, viz., speckled speckle and speckled speckled speckle. Moreover, the recent introduction of phasor-field ($\mathcal{P}$-field) NLoS imaging---which relies on amplitude-modulated coherent illumination---requires pushing beyond cw scenarios for speckle and higher-order speckle. In this paper, we take first steps in addressing the foregoing needs using a three-diffuser transmissive geometry that is a proxy for three-bounce NLoS imaging. In the small-diffusers limit, we show that the irradiance variances of cw and modulated $n$th-order speckle coincide and are $(2^n-1)$-times those of ordinary (first-order) speckle. The more important case for NLoS imaging, however, involves extended diffuse reflectors. For our transmissive geometry with extended diffusers, we treat third-order cw speckle and first-order modulated speckle. Our results there imply that speckle is unlikely to impede successful operation of coherent-illumination cw imagers, and they suggest that the same might be true for $\mathcal{P}$-field imagers.
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