目的：利用三维光弹性实验研究骨盆周围肌肉作用力对骨盆环应力分布的影响。
Objective: Our aim was to investigate the effects of the muscular contractility around pelvis on the stress-distribution of the pelvic ring by the threE dimensional photoelastic experiment.
模拟结果表明，利用三环相位光瞳滤波器，不仅可以在焦面上实现光强的平顶分布，而且还可以得到单环衍射光束。
The results indicate that flat-top beam shaping and single-circle beam shaping at the focal plane can all be realized by using three-zone annular phase pupil filters.
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