中国科学院机构知识库网格系统: 检索

A novel method for hull's three dimensional deformation measurement 会议论文 OAI收割
2013 International Conference on Applied Mechanics, Mechatronics and Intelligent System, AMMIS 2013, April 19, 2013 - April 21, 2013, Changsha, China
作者: Liu X.-M.

收藏 | 浏览/下载：7/0 | 提交时间：2014/05/15

Analysis of Moire minimization in autostereoscopic parallax displays 会议论文 OAI收割
2010 Massachusetts Ave, NW, Washington, DC, DC 20036-1023, United States
Kong L.; Jin G.; Wang T.

收藏 | 浏览/下载：12/0 | 提交时间：2014/05/15

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：20/0 | 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 会议论文 OAI收割
2011
Wang M. J.; Wu Z. G.

收藏 | 浏览/下载：4/0 | 提交时间：2013/03/28

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：15/0 | 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.

Theoretical research of aspheric testing by using the digital moire patterns base on the sub-region splicing method 会议论文 OAI收割
2011
Man Y. C.; Zhang X. J.

收藏 | 浏览/下载：8/0 | 提交时间：2013/03/28

Graph fitting test method for the interpolation error of Moire fringe (EI CONFERENCE) 会议论文 OAI收割
9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China
作者: Sun Y.; Sun Y.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

Small roll angle measurement based on auto-collimation and moire fringe (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Optical Instruments and Technology - Optoelectronic Measurement Technology and Systems, October 19, 2009 - October 22, 2009, Shanghai, China
Bai X.-G.; Cai S.; Qiao Y.-F.; Dai M.

收藏 | 浏览/下载：30/0 | 提交时间：2013/03/25

A novel method for small roll angle measurement based on auto-collimation and moire fringe is presented. A right-angle prism is used as an indicator of small roll angle around the optical axis and a CCD is used to collect moire fringes that are generated by scale grating image which is reflected by prism and index grating. Any small roll angle of the prism will change the include angle of the grating pair and meanwhile induce a change in the moire fringe period. The relationship between roll angle and period of moire fringes is established. The period data is obtained by image processing. The experimental result certifies that the principle of small angle measurement method based on auto-collimation and moire fringe is correct and feasible. The measuring error is smaller than 0.2 within 7 range compared with 0.2 autocollimator. 2009 SPIE.

Influence of a general small inclination of two gratings on the moire fringe (EI CONFERENCE) 会议论文 OAI收割
CLEO/Pacific Rim 2009 - 8th Pacific Rim Conference on Lasers and Electro-Optics, August 30, 2009 - September 3, 2009, Shanghai, China
Cai S.; Qiao Y.-F.

收藏 | 浏览/下载：12/0 | 提交时间：2013/03/25

The effect of a general small inclination between the two grating planes on the period of the moire fringes under illumination with a plane wave is studied. 2009 IEEE.

Three-dimensional angle measurement based on auto-collimation and moire fringe 会议论文 OAI收割
2009
Cai S.; Liang S. A.; Qiao Y. F.

收藏 | 浏览/下载：10/0 | 提交时间：2013/03/28