1 School of Automation, Harbin University of Science and Technology, Harbin 150080, China
2 Sino Rubber Technology Co., Ltd, Hengshui 053000, China
1 哈尔滨理工大学自动化学院，哈尔滨 150080
2 衡橡科技股份有限公司，河北 衡水 053000
以SCARA机器人、机械夹爪、摄像机CCD为硬件基础，搭建了基于单目视觉的SCARA机器人自动识别和定位插件系统平台，并利用摄像机参数标定和建立的抓取系统参数化模型，将CCD摄像机获取的工件图像坐标信息转化为机器人坐标系下的抓取位置信息。本系统以Visual studio软件为开发平台，利用OpenCV视觉数据库函数进行颜色识别与定位算法开发，经测试，该视觉算法能够实现工件的颜色识别和获取工件的位置信息，并控制机器人夹爪进行目标工件的精确抓取，满足了一般工业生产中抓取工件实时性的要求。
SCARA机器人 单目视觉 插件系统 颜色识别 定位 精确抓取 SCARA robot monocular vision plug-in system color recognition positioning precision crawl
Author Affiliations
Abstract
1 School of Science, Foshan University, Foshan 528000, China
2 School of Electronics and Information Engineering, Foshan University, Foshan 528000, China
Temporal properties of random lasing under ultrashort pulse excitation are investigated in a two-dimensional disordered medium. The pumping light is described individually and coupled into the rate equations. The Maxwell equations and rate equations are numerically solved by using the finite-difference time domain method. The time evolution of the emission pulse is studied with the variation of the surface-filling fraction, refractive index, and scatterer radius. Results show that the behavior of random lasing depends strongly on the sample parameters. Our work enriches the knowledge about random lasers in the ultrashort pulse pumping regime and offers some guidance for relevant experiments.
140.3430 Laser theory 290.4210 Multiple scattering 320.7120 Ultrafast phenomena 190.5890 Scattering, stimulated Chinese Optics Letters
2015, 13(8): 081407
1 佛山科学技术学院理学院, 广东 佛山 528000
2 华中科技大学光学与电子信息学院, 武汉光电国家实验室, 湖北 武汉 430074
基于差频产生太赫兹的平面波近似理论，研究了陶瓷双波长激光抽运磷化镓产生太赫兹波的相位匹配特性、功率特性以及温度特性。结果表明，对于波长为1060 nm 附近的抽运光，可以采取共线匹配的方式获得较大的相干长度并满足产生高功率太赫兹辐射的要求。太赫兹辐射功率与磷化镓晶体的长度有关，对于某个特定波长的太赫兹辐射存在一个最佳的晶体长度。通过改变磷化镓晶体的温度可以调整差频过程的相位匹配效果，进而获得不同的相位匹配波长范围。数值模拟结果为陶瓷双波长激光抽运磷化镓产生太赫兹实验提供理论依据。
非线性光学 太赫兹 差频 双波长陶瓷激光 激光与光电子学进展
2015, 52(6): 061902
Author Affiliations
Abstract
1 School of Electronics and Information Engineering, Foshan University, Foshan 528000, China
2 Wuhan National Laboratory for Optoelectronics and School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
3 School of Electrical and Information Engineering, The University of Sydney, Sydney, NSW 2006, Australia
We propose a return-to-zero on-off keying (RZ-OOK) to non-return-to-zero (NRZ) OOK conversion scheme based on a single custom-designed fiber Bragg grating (FBG). The custom-made FBG is designed and syn-thesized using discrete layer-peeling algorithm. It is shown that such a FBG can replace the combination of interferometer and the cascaded filter that are invariably employed together in the reported schemes for -RZ-OOK to NRZ-OOK format conversion. Simulation results show that the input 20-Gb/s RZ-OOK signals with different duty cycles can be converted into NRZ-OOK signals with high Q-factor.
060.3735 Fiber Bragg gratings 060.2340 Fiber optics components 060.4080 Modulation Chinese Optics Letters
2014, 12(9): 090603
