10 February 2005 A novel interference fringes software counting method
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Abstract
Conventional interference fringes counting methods often process two sinusoidal interference signals with a phase difference of π/2 to realize fringe-counting. But when the signals fluctuate in half a period of the signal, the conventional fringe-counting method sometimes produces direction-distinguishing mistakes, then resulting in counting errors. To address the problem, this paper presents a novel interference fringes counting method that uses software to distinguish the forward or backward direction of interference fringe and to count. This fringe-counting method can accurately distinguish the moving direction induced by the fluctuation of interference fringes, so it has the advantages of exact counting, intelligence and reliability. An experimental setup based on a Michelson interferometer is constructed to demonstrate the utility of this fringe-counting method for displacement measurement, and experimental results with a range of 1036mm is presented.
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Yuanzhao Yang, Benyong Chen, Xiaowei Wu, Dacheng Li, "A novel interference fringes software counting method", Proc. SPIE 5638, Optical Design and Testing II, (10 February 2005); doi: 10.1117/12.574727; https://doi.org/10.1117/12.574727
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