20 November 2012 Temporal phase retrieval in dynamic speckle interferometry by adaptive emperical mode decomposition
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Abstract
Dynamic speckle interferometry using temporal phase analysis has larger measurement range and is easier to setup over phase-shifting based speckle interferometry. Hilbert transform (HT) is a widely used approach to implement analytic method based phase retrieval. To fulfill the requirements of HT based phase retrieval, EMD (Empirical Mode Decomposition) can be applied to remove the bias intensity. With the low noise assumption, the first IMF was taken as the input for HT. However, according to our experiments, some dynamic speckle signals are not as good as assumed. In many cases, the first IMF is not the proper one. To find the proper IMF, we proposed to adaptively find the IMF of largest similarity with the input signal. And the similarity is evaluated by mutual information. Simulation experiments were given to verify the validity of the proposed algorithm.
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Hao Zhang, Hao Zhang, Jin He, Jin He, Meng Zhu, Meng Zhu, Zhanhua Huang, Zhanhua Huang, } "Temporal phase retrieval in dynamic speckle interferometry by adaptive emperical mode decomposition", Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85630U (20 November 2012); doi: 10.1117/12.999617; https://doi.org/10.1117/12.999617
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