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	Small High-Resolution Angular Displacement Measurement Technology Based on Near-Field Image Acquisition 期刊论文 OAI收割 Ieee Sensors Journal, 2019, 卷号: 19, 期号: 15, 页码: 6141-6146 作者: X.D.Jia; Q.H.Wan; H.Yu; Y.Sun; C.H.Zhao \| 收藏 \| 浏览/下载：33/0 \| 提交时间：2020/08/24 Subdivision,high precision,high resolution,angular displacement,measurement,image detector,optical encoder
	Compensation of moire fringe sinusoidal deviation in photoelectrical encoder based on tunable filter (EI CONFERENCE) 会议论文 OAI收割 2011 Symposium on Photonics and Optoelectronics, SOPO 2011, May 16, 2011 - May 18, 2011, Wuhan, China 作者: Wang Y.; Wang Y.; Wang Y.; Wang Y.; Wang Y. 收藏 \| 浏览/下载：34/0 \| 提交时间：2013/03/25 In order to improve the precision of the absolute photoelectrical encoder a compensating method is put forward which restrains the harmonics in moire fringe signal. After analyzing the relationship between the subdividing error and the sinusoidal index a low-pass digital filter which can make the moire signal satisfy the need of 1024 subdivision is designed. Considering with the fundamental frequency varies with the rotating speed of encoder the tunable filter is adopted whose cutoff frequency is calculated according to the coarse information of the encoder. The simulating results show that the proposed method can improve the sinusoidal index especially at high rotating speed. At last the compensating algorithm is implemented in the terminal of satellite optical communication which needs high resolution. The experimental results show indicate that the developed method is feasible. 2011 IEEE.
	The design of acquisition circuit for grating digital signal based on FPGA (EI CONFERENCE) 会议论文 OAI收割 2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China 作者: Wang W.-G. 收藏 \| 浏览/下载：45/0 \| 提交时间：2013/03/25 In order to resolve the poor suppression capability of noise and fitter interference existing in grating encoder high-rate subdivision and the poor accuracy of kam-to counting circuit the results show that the design method will help improve the controlled object of measurement precision and control accuracy. 2010 IEEE. we design a circuit based on FPGA to realize multiplier kam and filter for the output of two-way orthogonal signal generated by Incremental Optical Encoder. The system is mainly divided into three modules such as filtering multiplier kam-to and counting. The main function of filter circuit is to eliminate the jitter and noise interference existing in the quadrate encoder signals. Kam-to multiplier circuit can accurately judge the full cycle and half-cycle of incremental encoder at the same time can make fourfold multiplier. Counting circuit can use IP cores owned by Quartus II which is not restricted on the median. At last timing simulation based on Modelsim carried on the three modules
	A novel optical subdivision method for dual-frequency interferometer 期刊论文 OAI收割 optik, 2008, 卷号: 119, 期号: 16, 页码: 772, 776 张志平; 程兆谷; 覃兆宇; 朱健强收藏 \| 浏览/下载：1516/368 \| 提交时间：2009/09/24 Interferometer Optical subdivision technique Fringe Scale factor
	光栅尺关键技术研究学位论文 OAI收割作者: 卢炎聪 \| 收藏 \| 浏览/下载：364/0 \| 提交时间：2018/12/26 光栅干涉仪 grating interferometer 标尺光栅 grating scale 光学细分 optical subdivision 信号探测 signal acquisition 位移测量 displacement measurement