用于高压电子式电流互感器的能力和数据复合光纤传输系统

This paper describes a prototype power delivery system developed for high voltage electronic current transformer (ECT) that uses laser light to transfer power to and communicates with the primary converter. The design is based on optical-to-electrical power converters, solid-state diode lasers and optical fibers. Command signals are transmitted via the same up-fiber used to send power from secondary power supply to primary converter. The upward data transmission is completed during the brief interruption of power delivery without affecting steady power-supply. A simple comparator added to the primary converter can take the command data. Experimental results show that the fibers can provide reliable up-link for data transmission at 200 kb/s from the secondary to the primary converter. Based on the delivery system, the secondary converter can control three auxiliary channels to provide additional information. These monitoring channels are used in a time-multiplexing mode to provide information about the operation temperature, voltage and current at the remote unit for monitoring the ECT. This preventive maintenance or built-in test can increase reliability by giving early warning for necessary maintenance request.     

用CCD图像传感器自动测量杨氏弹性模量的研究

介绍一种利用激光束照射光杠杆镜面，用高灵敏度的线型固态图像传感器CCD自动接受激光光束偏转方位来取代传统的依靠人眼从望远镜读数获取数据，实现过程自动化，从而消除测量过程中所产生的人为因素的影响，实验测量杨氏弹性模量的相对误差为0．88％，大大提高了测量精度。这一技术将传统的物理实验改进成了一个有意义的集设计、研究、综合于一体的实验。     

一种新型的基于MZ的LiNbO3调制器

对基于Mach-Zehnder(MZ)干涉型LiNbO3调制器的工作原理和各种光码型产生方案进行了分析,比较了几种目前DWDM光通信系统中常见的解决方案。理论分析表明,保持偏置工作点的稳定是产生NRZ、RZ以及CS-RZ码的关键。因此,提出了一种利用低频外调制的方法实现调制器工作稳定以及码型程控可调的方案。     

对晶体电光调制实验中输出光波曲线特性的理论分析

根据铌酸锂晶体的电光特性,分析了电光振幅调制器的调制原理,讨论了直流偏压对输出光波特性的影响.结果表明,只有调制器工作在线性调制部分,才能实现电光调制激光通信.     

光磁共振实验中数据处理

大学物理实验室中测量铷的朗德g 因数时,测得多个共振频率.这些频率是在扫场和地磁场下作用的结果.该文提出的数据处理方法可以消除地磁场和扫场的干扰,得到了很好的结果.     

Quantifying and visualizing change: Strain monitoring of tapestries with digital image correlation

A three-year research project at the University of Southampton (2007–2010) investigated whether monitoring techniques commonly used by engineers to assess the strength and durability of materials could be usefully applied to inform the condition assessment of historic tapestries. To date it has not been possible to obtain an objective picture of the overall condition of a tapestry; the study investigated whether it is possible to identify precursors of structural damage. The two techniques, digital image correlation (DIC) and optical fibre sensors, were used to monitor a representative wool fabric, specially woven tapestry samples, a newly woven tapestry, and historic tapestries, both in the laboratory and in situ in a historic house. This study first sets out to answer the question: can DIC be used to monitor and visualize strain in historic tapestries? It is shown that DIC can be used successfully. Secondly, it discusses the map function, a novel development which allowed the monitoring equipment to be moved, so that it could be used in situ in a historic house. Thirdly, it provides further details of the experimental work using optical fibre sensors to confirm the accuracy of the DIC technique.     

法布里珀罗干涉仪原理及应用分析

随着激光技术的发展,干涉被广泛的应用在许多领域,其中法布里-珀罗干涉仪因其结构特点,以及能够产生可见度较高的细锐干涉条纹的特点,在干涉的应用中发挥着重要作用.对于法布里珀罗干涉仪的结构原理和应用原理的分析为其更为深入的应用提供了理论支持.     

中国光纤光缆产业技术能力提高:逆向技术学习

产业技术学习是发展中国家技术创新研究和产业研究的中心问题之一。本文以中国光纤光缆产业为对象研究该产业的技术学习过程,发现中国光纤光缆产业的技术学习过程是逆向的,而且该产业同时存在"逆技术链学习"和"逆产业链学习"两类逆向学习过程。影响中国光纤光缆产业技术学习的主要因素分别是技术体制、制度环境、学习动力和学习基础。这4类因素在分产业(制棒、拉丝、成缆)的非均匀分布是中国光纤光缆产业逆向技术学习的主要原因。     

光学表面的光散射测量方法

光学表面的光散射测量方法为目前测量光学元件表面散射特性的一种主要技术,主要包括角分辨测量法和总积分测量法．本文对上述两种测量方法的基本原理和实验装置进行了系统的阐述,并对两种方法进行了比较分析．最后讨论了散射测量方法发展的趋势．     

“零工经济”背景下高职学生“U盘就业”能力的培养策略

随着互联网信息技术的不断发展,传统职业不断合并、消亡,共享经济的理念影响着人们的生活,催生了一种新经济形态——零工经济。以“U盘就业”、斜杠青年为代表的多职业现象和就业群体不断涌现,一人多职成为“零工经济”背景下的普遍就业方式。在“零工经济”背景下,就业形势更加灵活、工作内容更加多元,就业渠道更加广阔,这对高职学生的就业能力提出了更高的要求。高职院校作为培养人才的主要场所,应该根据零工经济的特点和影响,探索新经济形态下高职学生“U盘就业”能力培养的策略,通过推进现代学徒制度、构建跨界化课程体系、树立项目化的教学理念、开展多岗化实践体验、建立职业能力评价体系、完善职业生涯辅导机制等路径,培养出满足产业发展新需求的多职业技能组合和职业跨界能力的人才,确保高职学生不断完善自我,适应时代发展的需要。