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	Dual-frequency-moiré based absolute position sensing for lens focusing
	Yin, Didi1,2,3; Wang, Yahui1,2; Di, Chengliang1,3
	2015
会议名称	Proceedings of SPIE - The International Society for Optical Engineering
会议日期	2015
卷号	9677
页码	96770C
中文摘要	Micro motor, a typical equipment to adjust the zoom lens, together with a position feedback sensor constitute the closed position loop, which is the key factor to perform successfully accurate lens focusing. Traditionally, the incremental grating ruler tends to be adopted as the position sensor, which continues counting the number of grating pitches on a dynamic one-dimensional moving platform. Instead of incremental counting, this paper proposes a dual-frequency-moiré based absolute position sensing method for reading immediate position at static environment. According to the relative positions of two kind of moiré, the absolute position of the measurement point can be retrieve at nano-meters level through look-up table. By the way, the measurement range can be expanded to millimeters level satisfying the demands of lens focusing, and furthermore the measurement efficiency is improved greatly without dynamic moving. In order to verify the performances of proposed method, a model of dual-frequency-moiré is built, and theological principles are deduced. Finally, the simulation results indicate that, with established configurations, dual-frequency-moiré could measure position within 0∼5000μm. At the same time, the measurement accuracy achieves nano-meters level. © 2015 SPIE.
英文摘要	Micro motor, a typical equipment to adjust the zoom lens, together with a position feedback sensor constitute the closed position loop, which is the key factor to perform successfully accurate lens focusing. Traditionally, the incremental grating ruler tends to be adopted as the position sensor, which continues counting the number of grating pitches on a dynamic one-dimensional moving platform. Instead of incremental counting, this paper proposes a dual-frequency-moiré based absolute position sensing method for reading immediate position at static environment. According to the relative positions of two kind of moiré, the absolute position of the measurement point can be retrieve at nano-meters level through look-up table. By the way, the measurement range can be expanded to millimeters level satisfying the demands of lens focusing, and furthermore the measurement efficiency is improved greatly without dynamic moving. In order to verify the performances of proposed method, a model of dual-frequency-moiré is built, and theological principles are deduced. Finally, the simulation results indicate that, with established configurations, dual-frequency-moiré could measure position within 0∼5000μm. At the same time, the measurement accuracy achieves nano-meters level. © 2015 SPIE.
收录类别	SCI ; EI
学科主题	Equipment - Focusing - Micromotors - Optical testing - Table lookup
语种	英语
ISSN号	0277-786X
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/7424]
专题	光电技术研究所_光电工程总体研究室（一室）
作者单位	1.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, China 2.Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu, China 3.University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Yin, Didi,Wang, Yahui,Di, Chengliang. Dual-frequency-moiré based absolute position sensing for lens focusing[C]. 见:Proceedings of SPIE - The International Society for Optical Engineering. 2015.

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