Experimental study about undersampling phase unwrapping
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摘要: 为了解决相位解包裹时由于相位变化快而出现的欠采样问题,采用剪切干涉的原理建立光场,利用加权离散余弦变换算法求解泊松方程的方法,实现了对横向剪切最小二乘相位解包裹算法的改进。在理论分析的基础上给出了具体的相位解包裹算法,并通过实验研究验证了改进后算法的可行性。结果表明,改进后的算法能够有效地避免由相位变化过快带来的欠采样问题。Abstract: In order to solve the undersampling problem of phase unwrapping caused by fast changing of phase, the theory of lateral shearing interferometry was introduced to build optical field and weighted discrete cosine transform was used to solve Poisson equation. On this basis, a new improved least square algorithm based on lateral shearing interferometry(LSBLS) algorithm was put forward. The specific phase unwrapping method was given based on theoretical analysis and the feasibility of the improved algorithm was proved after experimental verification. The results show that the improved algorithm can effectively avoid the undersampling problem caused by the fast changing of phase.
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