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.
对圆柱正截面和量块表面的测量试验验证了该测量系统对自由曲面和金属强反射表面测量的可行性。
Through measuring cylindrical section and surface of gauge block, this system is viable to measure free-form surface and high-reflective metallic surface.
激波在自由面反射后，自由表面附近的粒子速度为活塞速度的二倍，这和宏观力学结果相同。
After reflection, the average particle velocity near free surface is equal to twice the piston velocity approximately, which agrees with macroscopic phenomena.
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