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径向剪切干涉仪所采集到的干涉图并不直接反映原始待测波面信息,为了获得原始待测波面信息,波面重构是必要的。推导了波面重构的迭代算法,并用Matlab分别对径向剪切中不同迭代次数、不同剪切比的波面重构迭代算法进行了数值模拟,得出以下结论:合适的剪切比可以简化迭代运算,提高运算速度;与小畸变波面重构相比,残差波面PV值达到相同精度时,大畸变波面重构需要更多的迭代次数。待测波面的PV值大于10λ时,剪切比应在0.7以上,PV值大于6λ小于10λ,剪切比在0.5~0.7之间,PV值小于6λ,剪切比小于0.5。
The interferograms collected by the radial shearing interferometer do not directly reflect the information of the original wave surface to be measured. In order to obtain the information of the original wave surface to be measured, wavefront reconstruction is necessary. The iterative algorithm of wavefront reconstruction is deduced and the iterative algorithms for wavefront reconstruction of different shear ratios and different shear ratios in radial shear are numerically simulated respectively by Matlab. The conclusion is drawn that the suitable shear ratio can simplify the iteration Compared with the small distortion wavefront reconstruction, when the residual wavefront PV value reaches the same precision, the larger distortion wavefront reconstruction needs more iterations. The shear wave ratio should be above 0.7 when the PV value of the wave surface to be measured is greater than 10λ, the PV value is greater than 6λ and less than 10λ, the shear ratio is between 0.5 and 0.7, the PV value is less than 6λ, and the shear ratio is less than 0.5.