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．     

Shedding light on neurons: optical approaches for neuromodulation

Today''s optical neuromodulation techniques are rapidly evolving, benefiting from advances in photonics, genetics and materials science. In this review, we provide an up-to-date overview of the latest optical approaches for neuromodulation. We begin with the physical principles and constraints underlying the interaction between light and neural tissue. We then present advances in optical neurotechnologies in seven modules: conventional optical fibers, multifunctional fibers, optical waveguides, light-emitting diodes, upconversion nanoparticles, optical neuromodulation based on the secondary effects of light, and unconventional light sources facilitated by ultrasound and magnetic fields. We conclude our review with an outlook on new methods and mechanisms that afford optical neuromodulation with minimal invasiveness and footprint.     

基于光反馈自混合干涉的振动测量研究

自混合干涉技术已经广泛应用于位移测量,本文应用三角波电流调制半导体激光器,使反馈光与腔内光产生自混合干涉,利用模跳现象测量微位移．模跳的引入提高了系统的测量精度,有良好的应用价值．