此外，他们还担心“天空回散照射（sky shine）”的问题：房顶散发的辐射会被大气中的颗粒向下反射。
They were also concerned about “sky shine”: radiation emanating from the roof that’s reflected downward by atmospheric particles.
激光经过被测表面反射和散射后，通过自由空间传播至观察面上形成散斑图像，其统计分布依赖于被测表面的微观形貌。
Speckle images are produced by the reflected and scattered light beams from rough surface through free-space to observing plane when laser illuminates the object surface.
本文最后提出了旨在提高测量灵敏度的二种实验技术-反射式激光散斑照相法与附加位移法。
Finally, two experimental techniques -the reflective laser speckle photography and the image shift are presented to improve the measurement sensitivity.
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