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.
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。
With a continuously distributed dislocation model, this paper deals with cracks inclined to a free surface of a semi infinite plane under remote loadings.
采用连续分布位错模型讨论和分析了受远处载荷下半无限平面自由边界附近任意方位的裂纹问题。
Free form surface is most important feature to shape of product such as plane, automobile, motorcycle.
自由曲面是工业产品，尤其是飞机、汽车、摩托车等行业产品外形的重要特征。
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