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Dual-frequency-moiré based absolute position sensing for lens focusing
Yin, Didi1,2,3; Wang, Yahui1,2; Di, Chengliang1,3
Volume9677
Pages96770C
2015
Language英语
ISSN0277-786X
DOI10.1117/12.2197026
Indexed BySCI ; Ei
Subtype会议论文
AbstractMicro 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.; 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.
Conference NameProceedings of SPIE - The International Society for Optical Engineering
Conference Date2015
Citation statistics
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7424
Collection光电工程总体研究室(一室)
Affiliation1. 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
Recommended Citation
GB/T 7714
Yin, Didi,Wang, Yahui,Di, Chengliang. Dual-frequency-moiré based absolute position sensing for lens focusing[C],2015:96770C.
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