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浏览/检索结果: 共15条，第1-10条 帮助

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Moire fringes in nanoprecipitates in a zirconium alloy 期刊论文  OAI收割
MATERIALS LETTERS, 2020, 卷号: 269, 页码: 4
作者:  Liu, Chengze;  Yuan, Fusen;  Han, Fuzhou;  Ali, Muhammad;  Zhang, Yingdong
  |  收藏  |  浏览/下载：18/0  |  提交时间：2021/02/02
A Moire-Based Four-Channel Focusing and Leveling Scheme for Projection Lithography 期刊论文  OAI收割
IEEE PHOTONICS JOURNAL, 2014, 卷号: 6, 期号: 4
作者:  Di, Chengliang;  Yan, Wei;  Hu, Song;  Li, Yanli;  Yin, Didi
收藏  |  浏览/下载：35/0  |  提交时间：2015/07/10
Influence of Collimation on Alignment Accuracy in Proximity Lithography 期刊论文  OAI收割
IEEE PHOTONICS JOURNAL, 2014, 卷号: 6, 期号: 4
作者:  Wang, Nan;  Jiang, Wei;  Zhu, Jiangping;  Tang, Yan;  Yan, Wei
收藏  |  浏览/下载：32/0  |  提交时间：2015/07/10
Collimation Sensing With Differential Grating and Talbot Interferometry 期刊论文  OAI收割
IEEE PHOTONICS JOURNAL, 2014, 卷号: 6, 期号: 3
作者:  Wang, Nan;  Tang, Yan;  Jiang, Wei;  Yan, Wei;  Hu, Song
收藏  |  浏览/下载：32/0  |  提交时间：2015/07/10
A modified alignment method based on four-quadrant-grating moire for proximity lithography 期刊论文  OAI收割
OPTIK, 2014, 卷号: 125, 期号: 17, 页码: 4868-4872
作者:  Di, Chengliang;  Zhu, Jiangping;  Yan, Wei;  Hu, Song
收藏  |  浏览/下载：25/0  |  提交时间：2015/07/10
Influence of tilt moire fringe on alignment accuracy in proximity lithography 期刊论文  OAI收割
OPTICS AND LASERS IN ENGINEERING, 2013, 卷号: 51, 期号: 4, 页码: 371-381
作者:  Zhu, Jiangping;  Hu, Song;  Yu, Junsheng;  Tang, Yan;  Xu, Feng
收藏  |  浏览/下载：22/0  |  提交时间：2015/04/17
Alignment method based on matched dual-grating moire fringe for proximity lithography 期刊论文  OAI收割
OPTICAL ENGINEERING, 2012, 卷号: 51, 期号: 11
作者:  Zhu, Jiangping;  Hu, Song;  Yu, Junsheng;  Tang, Yan
收藏  |  浏览/下载：22/0  |  提交时间：2015/07/10
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：30/0  |  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 Research of real time auto-recognition of the moire fringe (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wang M.-J.; Wu Z.-G.
收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25
Measuring the movement of raster by the method of moire fringe has the advantage of high sensitivity  high resolution and non-contacted measurement. The characteristic of moire fringe is that the image is white alternate with black  the angle of the stripes is uniform  the width of the stripes is uniform  the terminators of the stripes aren't clear. A fast method that can figure out the width and angle of the moire fringe precisely is put forward in this paper. It calculates the angle the stripes firstly. According to the principle of the minimum mean squared error (MMSE)  the closer a series of data is  the smaller the value of the MMSE will be. The method is described as follows: It takes the image's center as the origin  180 beelines pass through the origin with the same angle interval. it calculates the value of the minimum mean squared error of the 180 beelines and find out the least one among those  then the angle of the moire fringe comes out primarily. In order to improving the calculating precision of moire fringe  60 equal angles are divided in the neighborhood of the angle  then a precise angle of moire fringe is calculated according to the principle of the MMSE. After getting out the angle of the moire fringe  we begin to calculate the width of moire fringe. A line vertical with the moire fringe is drawn  and we can get the width of the moire fringe by the vertical line. In order to get over the influence of the noise  an effective area with the shape of diamond is selected in the image. The data of area is accumulated and projected according to the direction of moire fringe  and a sine curve come out. The width of moire fringe can be obtained by getting the position of the first wave crest  the position of the last wave crest and the number of wave crest. Experiments prove that the precision of the method put forward in this paper is enhanced in comparison with the traditional frequency method  the precision of width calculation achieves to 99.6% according to the evaluation indicators of width detection error. The computing speed is boosted largely compared with traditional method  and it can achieve with 15 ms  that satisfying the demand of real time. 2011 SPIE.  
Dislocations in charge-ordered Pr(0.5)Ca(0.5)MnO(3) epitaxial thin films prepared by a two-step growth technique 期刊论文  OAI收割
Philosophical Magazine Letters, 2010, 卷号: 90, 期号: 5, 页码: 323-336
Y. L. Zhu; X. Wang; M. J. Zhuo; Y. Q. Zhang; X. L. Ma
收藏  |  浏览/下载：19/0  |  提交时间：2012/04/13