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The paper considers optical linear encoder based on diffraction gratings. A method of quadrature signals phase shift stabilization based on the application of head grating with specific structure is proposed. The optical scheme of position encoder based on measuring head grating with specific structure is developed and described in this paper. Mathematical modeling of quadrature signals phase shift depending on grating parameters is carried out. Based on the simulation, we propose optimal parameters of head grating structure. Design process and results for head gratings are presented in the paper.
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A. Y. Zherdev, M. S. Kovalev, M. V. Shishova, S. B. Odinokov, D. S. Lushnikov, V. V. Popov, "Quadrature phase shift and modulation amplitude of signals in optical encoder," Proc. SPIE 11030, Holography: Advances and Modern Trends VI, 110300X (23 April 2019); https://doi.org/10.1117/12.2520752