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, Ya'nan Wang, Huawei Wang, Huawei Wang, Fusheng Hao, Fusheng Hao, Liqiang Liu, 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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