28 February 2017 A novel approach of an absolute coding pattern based on Hamiltonian graph
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Proceedings Volume 10256, Second International Conference on Photonics and Optical Engineering; 102563K (2017) https://doi.org/10.1117/12.2257823
Event: Second International Conference on Photonics and Optical Engineering, 2016, Xi'an, China
Abstract
In this paper, a novel approach of an optical type absolute rotary encoder coding pattern is presented. The concept is based on the principle of the absolute encoder to find out a unique sequence that ensures an unambiguous shaft position of any angular. We design a single-ring and a n-by-2 matrix absolute encoder coding pattern by using the variations of Hamiltonian graph principle. 12 encoding bits is used in the single-ring by a linear array CCD to achieve an 1080-position cycle encoding. Besides, a 2-by-2 matrix is used as an unit in the 2-track disk to achieve a 16-bits encoding pattern by using an area array CCD sensor (as a sample). Finally, a higher resolution can be gained by an electronic subdivision of the signals. Compared with the conventional gray or binary code pattern (for a 2n resolution), this new pattern has a higher resolution (2n*n) with less coding tracks, which means the new pattern can lead to a smaller encoder, which is essential in the industrial production.
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Ya'nan Wang, Huawei Wang, Fusheng Hao, Liqiang Liu, "A novel approach of an absolute coding pattern based on Hamiltonian graph", Proc. SPIE 10256, Second International Conference on Photonics and Optical Engineering, 102563K (28 February 2017); doi: 10.1117/12.2257823; https://doi.org/10.1117/12.2257823
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