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为了克服粗糙表面分形测量的困难，提出一种新的测量方法──投影覆盖法（ProjectiveCoveringMethod），结合激光表面测量技术，直接测定断裂表面的分形维数Ds∈[2，3）.用分形理论证明，应用该方法进行分形测量的精确性。
In order to overcome the difficulty of fractal measurement on rough surface, a new measurement method called projection method (ProjectiveCoveringMethod) is proposed to measure the fractal dimension Ds ∈ [2, 3] directly on the fracture surface with the laser surface measurement technique.Using fractal theory Prove that the accuracy of the fractal measurement using this method.