Verification of speckle contrast measurement interrelation with observation distance
Verification of speckle contrast measurement interrelation with observation distance
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验证散斑对比度测量与观察距离的相互关系
DOI：
10.1007/s10043-014-0015-z
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Furukawa
中科院分区：
文献类型：
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作者：
Koji Suzuki;T. Fukui;S. Kubota;Y. Furukawa
采用定量测量技术，测量了两种激光投影仪在不同观测距离和观测透镜针孔直径下的散斑对比度。我们发现散斑对比度作为观测数值孔径的函数随投影结构而变化。在全画幅投影机中，它与数值孔径成正比，但在光栅扫描投影机中，它与数值孔径的平方根成正比。基于Goodman散斑理论，分析了散斑对比度差与数值孔径的关系。所得到的结果被认为是非常有用的，适用于散斑评价和显示资格在任意观察者的位置。
The speckle contrasts of two types of laser projectors were measured at various observation distances and observation lens pinhole diameters using a quantitative measurement technique. We found that the speckle contrast as a function of the observation numerical aperture varies with the projection architecture. In a full-frame projector, it is proportional to the numerical aperture, but it is proportional to its square root in a raster-scanned projector. The difference in speckle contrast as a function of the numerical aperture was analyzed based on Goodman’s speckle theory. The obtained results were found to be very useful and applicable for speckle evaluation and display qualifications in an arbitrary observer’s position.