... 全球定位系统 global positioning system； GPS 像片索引图 index of photography 三角测量 trigonometric survey； triangulation ...
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By means of laser speckle photography, the speckle displacement caused by refraction in transparent medium is measured. The thickness and the index of refraction is then calculated.
用激光散斑照相的方法测量了因光在透明介质中折射而引起的散斑位移，并求出介质的厚度与折射率。
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