文中采用陈至达(1962年)的光测应力分析基本方程，并导出适合于光弹性数据处理的三次样条函数。
Basic equation of photoelastic stress analysis by Chen (1962) is adopted; and a cubic spline function suitable for processing of photoelastic data is derived.
通过使用微分方程的方法，我们得到了和陈等人2006年相同的结果。
By using the derivative method, we obtained the same result with that of the previous work of Chen, et al. in 2006.
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