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Versatile G-quadruplex-mediated strategies in label-free biosensors and logic systems 期刊论文  OAI收割
analyst, 2015, 卷号: 140, 期号: 8, 页码: 2556-2572
作者:  
Ren,Jiangtao;  Wang,Tianshu;  Wang,Erkang;  Wang,Jin
收藏  |  浏览/下载:99/0  |  提交时间:2016/05/12
A small thickness measurement system based on PSD and FPGA (EI CONFERENCE) 会议论文  OAI收割
3rd International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2011, January 6, 2011 - January 7, 2011, Shanghai, China
作者:  
Guo J.;  Guo J.;  He X.
收藏  |  浏览/下载:30/0  |  提交时间:2013/03/25
Considering that the requirement of industrial manufacture  An AT89S51 singlechip works as the core processor of the system. By two laser triangulation  a small thickness measurement system based on PSD and FPGA is presented. It takes S3931 PSD of one dimension as position detection device  A FPGA produces logic control signals for the whole system  the small displacement is converted to differential voltages  which is made by Hamamatsu in Japan  and after amplification and A/D transformation  8-bit parallel data is send to singlechip from FPGA by external interrupts  and the final calculation results output to the LCD display module. After digital micro meter calibration  we get the small thickness. Experiments show that the detection accuracy of the system is not less than 10um.  
Far-field focusing of laser beam based on digital image processing techniques (EI CONFERENCE) 会议论文  OAI收割
Optoelectronic Imaging and Multimedia Technology, October 18, 2010 - October 20, 2010, Beijing, China
作者:  
Zhao S.;  Tian Y.-Z.;  Liu L.-S.;  Guo J.;  Zhang H.-Y.
收藏  |  浏览/下载:28/0  |  提交时间:2013/03/25
In order to lead the laser beam transmit in the atmosphere convergently  an experiment of laser focus at the distance of 450m and 300m has been operated in the outdoor place. The actual manipulations are as follows: Firstly  the laser was collimated by a beam expander  then the near-parallel laser beam was transmitted with a Galileo telescope system  and the distance between the concave lens and the convex lens can be tuned through a precise displacement platform  so the focus of the system changed due to the tiny displacement of the concave lens. Secondly  the average power of the laser spot can be measured using power meter  the power is 47.67mW and the standard deviation is 0.67mW while the focal length is 450m. Thirdly  the energy distribution was found through the laser beam analyzer. The spot images were saved using the beam analyzer  then the saved image can be processed with Matlab software afterwards. The function named EDGE and Sobel operator was used in the pre-processing of the saved image  then method of median filter was used in the course of image de-noising and 53H filter was adopted in the signal analysis. The diameter of laser spot was obtained by the method above  the diameter is 5.56mm and the standard deviation is 0.24mm. The spot center excursion is 0.56mm  it is 10.43% of the total diameter of the laser spot. At last  the key factors of the energy dissipation in the focusing system can be summarized as follows: restriction of the diffraction limit  attenuation in the atmosphere  geometrical aberration of optical system  and the diffraction limit and the geometrical aberration are significant in the three factors above  so we can reduce the impact of the both factors during the design of optical system. The reliable referenced data of the system design can be acquired through the primary experiment research. 2010 SPIE.  
Parallel plate interferometer with a reflecting mirror for measuring angular displacement 期刊论文  OAI收割
opt. rev., 2007, 卷号: 14, 期号: 5, 页码: 314, 318
郑德锋; 王向朝; Sasaki Osami
收藏  |  浏览/下载:977/247  |  提交时间:2009/09/18
一种基于平板横向剪切干涉的角位移测量方法 期刊论文  OAI收割
中国激光, 2007, 卷号: 34, 期号: 8, 页码: 1125, 1129
郑德锋; 王向朝
收藏  |  浏览/下载:1017/156  |  提交时间:2009/09/18
Dynamics in Newtonian-Riemannian space-time (II) 期刊论文  OAI收割
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION, 2001, 卷号: 22, 期号: 4, 页码: 425-435
作者:  
Zhang, RY
  |  收藏  |  浏览/下载:15/0  |  提交时间:2018/07/30
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