为实现LED数字投影机短距离内投影出更大的画面，文中针对此类投影机的结构特点，通过理论计算和ZEMAX光学设计软件的优化，开发设计一款适用于LED光源0.7 in （1 in=2.54 cm ）单芯片数字投影机的短焦投影物镜。给出工作波长为462~625...为实现LED数字投影机短距离内投影出更大的画面，文中针对此类投影机的结构特点，通过理论计算和ZEMAX光学设计软件的优化，开发设计一款适用于LED光源0.7 in （1 in=2.54 cm ）单芯片数字投影机的短焦投影物镜。给出工作波长为462~625 nm、全视场角为84o、相对孔径为1：2.4、焦距为10 mm、后工作距离大于20 mm的镜头设计实例。镜头有较好的成像质量,在分辨率极限40 lp/mm处,0.7视场以内的MTF值均大于0.5，全视场畸变量的绝对值小于1.5%，像质优良。设计结果显示，文中提出的设计方法有利于降低投影系统成本，实现产业化生产。展开更多
Korea Electric Power Corporation in charge of the power IT project ＂Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology＂, is performing the verification of perf...Korea Electric Power Corporation in charge of the power IT project ＂Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology＂, is performing the verification of performance of the substation automation system based on IEC 61850. In order to verify a transformer protective lED that might be operating in substation automation system, the new standardized document and procedures are required in the aspect of the utility like KEPCO. But there is nothing to describe systematically how to verify IEC 6 1850 based lED in the system environment except an individual IED testing way. This paper will present the substation automation system based ways and procedures to verify the protective function of the IED using UML （Unified Modeling Language）.展开更多
文摘为实现LED数字投影机短距离内投影出更大的画面，文中针对此类投影机的结构特点，通过理论计算和ZEMAX光学设计软件的优化，开发设计一款适用于LED光源0.7 in （1 in=2.54 cm ）单芯片数字投影机的短焦投影物镜。给出工作波长为462~625 nm、全视场角为84o、相对孔径为1：2.4、焦距为10 mm、后工作距离大于20 mm的镜头设计实例。镜头有较好的成像质量,在分辨率极限40 lp/mm处,0.7视场以内的MTF值均大于0.5，全视场畸变量的绝对值小于1.5%，像质优良。设计结果显示，文中提出的设计方法有利于降低投影系统成本，实现产业化生产。
文摘Korea Electric Power Corporation in charge of the power IT project ＂Development of Prototype for Advanced Substation Automation System based on the Digital Control Technology＂, is performing the verification of performance of the substation automation system based on IEC 61850. In order to verify a transformer protective lED that might be operating in substation automation system, the new standardized document and procedures are required in the aspect of the utility like KEPCO. But there is nothing to describe systematically how to verify IEC 6 1850 based lED in the system environment except an individual IED testing way. This paper will present the substation automation system based ways and procedures to verify the protective function of the IED using UML （Unified Modeling Language）.
