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Fringe-pattern demodulation using an iterative linear digital phase locked loop algorithm
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DOI：10.1016/j.optlaseng.2004.08.006.png)
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Abstract
En 中文
A novel technique called an iterative linear digital phase locked loop (DPLL) for fringe-pattern demodulation is presented. The proposed technique has better noise immunity than the basic one-dimensional DPLL algorithms (e.g., conventional and linear DPLLs) because it processes a fringe pattern in two dimensions. In the first iteration of the proposed algorithm, it uses a flat reference to estimate the phase of the fringe pattern. The estimated phase map resulting from the first iteration is smoothed using a moving average window and then it is used as a reference to estimate the phase of the fringe pattern in the second iteration. In the third iteration, the phase map resulting from the second iteration is smoothed and used as a reference to estimate the phase of the fringe pattern in the fourth iteration and so on until the demodulated phase map has a good signal-to-noise ratio. (c) 2004 Elsevier Ltd. All rights reserved.
Keywords:
linear digital phase locked loop
fringe pattern analysis
profilometry
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