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利用交流电桥可以精确测量电容器的电容.由于该电桥结构复杂,对测量结果的影响因素是多方面的.本文探讨了对测量结果的不确定度的评价方法,试图完善交流电桥实验的教学内容. 相似文献
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在自搭交流电桥测量电容电感的实验中,市电干扰信号的影响不可忽略.本文给出了一种利用示波器鉴别和区分市电干扰信号电压与电桥不平衡电压的方法. 相似文献
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北京崇文光电器件厂技术组 《物理》1974,(5)
硅光电池也称为硅太阳能电池,它属于把光能转换成电能的半导体光电器件. 当前,硅光电池正日益广泛地在现代电子技术中发挥其特有的本领,起着重要的作用.例如纺织、机械、化工、交通、电影、印刷等工业部门以及卫生、科研、国防等方面都有大量应用.随着我国国防、科技和工农业的迅猛发展,硅光电池的应用范围将更加广泛. 本文就硅光电池的结构特点、工作原理、性能和应用几个方面作一简单介绍. 一、结构及工作原理 硅光电池是用单晶硅制成的一种光电池,目前硅光电池有2CR和2DR两种类型.2CR型硅光电池是在一块一定形状的n型硅片上用扩散的办… 相似文献
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一、前 言 交流磁化率的测量已有很长的历史,过去大都用来作为低温温度计和用来决定超导材料的超导转变温度等.近十年来由于自旋玻璃现象的发现,交流磁化率的测量又成为研究自旋玻璃的重要方法.交流磁化率测试方法主要有两类:(1)交流互感电桥,如哈特森(Hart-shorn)[1,2,3,4]电桥;(2)自感法[5],即测量样品在线圈中引起的电感变化.其中交流互感电桥方法使用的很普遍,并且随着电子技术的发展,它的测量灵敏度和测试精度都有很大提高.灵敏度可达到10-8emu,相对精度达到 0.1%.我们制作的互感电桥灵敏度为2.56×10-8emu/μV.用锁相放大器检测时,可… 相似文献
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交流电桥实验分析与研究 总被引:2,自引:1,他引:1
针对交流电桥实验中学生很困惑的三个问题进行分析和讨论,即:电桥平衡时应满足灵敏阈小于基本误差的1/10;交流电桥工作频率定为1000HZ;磁介质电感测量值与工作电流密切相关. 相似文献
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在自搭交流电桥测量电容电感的实验中,市电干扰信号的影响不可忽略,本文给出了一种利用示波器鉴别和分市电博物坟与电桥不平衡电压的方法。 相似文献
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K. Makoshi N. Shima Y. Otsuka 《Physica E: Low-dimensional Systems and Nanostructures》2005,29(3-4):656
A simple expression of the electric conductance through a nanostructure connected to two electrodes is obtained by using the phase-shift analysis. The Green function theory applicable to the nonequilibrium system is employed to formulate the electric conductance. The 0 bias limit, i.e., the linear response approximation is taken. The relation between Green functions and phase-shifts is obtained by extending the method applied to the single impurity problem in the metal. It is shown that a channel does not contribute to the conductance if its phase-shift is an integer multiple of π. Also shown is the importance of the effect due to multiple orbitals in nanostructures. Some concrete examples leading to simpler forms are given. 相似文献
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N. M. Zubarev 《Journal of Experimental and Theoretical Physics》1999,89(6):1078-1085
A broad class of exact solutions is obtained for the problem of the equilibrium configuration of the charged surface of a
conducting liquid allowing for capillary forces. An analysis of the solutions showed that when the amplitudes of the perturbations
reached certain critical values, the region occupied by the liquid ceases to be singly connected, which corresponds to the
formation of liquid metal droplets. It is shown that a steady-state liquid metal profile may exist for which appreciable local
amplification of the electric field can be achieved.
Zh. éksp. Teor. Fiz. 116, 1990–2005 (December 1999) 相似文献
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The Method of Images poses an important difficulty when used to solve the problem of a charge in the presence of a grounded conducting sphere. This arises from the fact that the sum of the inducing charge and the image charge is different from zero. As a consequence, there is a monopole field far from the system, and any ground wire physically connected to the sphere will carry an electric current, changing the initial balance of charges until a new equilibrium is reached. The approach taken in this paper assumed an infinite straight wire connecting the sphere to ground. The charge distribution over the surface of the conductors was calculated, and the results analyzed. It was shown that the thinner the wire, the lower will be its total charge, and the closer will be the calculated charge density at the surface of the sphere to the conventional solution by the Method of Images. 相似文献
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《Physics letters. A》2014,378(28-29):1952-1955
The phonon scattering and thermal conductance properties have been studied in two coupled graphene nanoribbons connected by different bridge atoms by using density functional theory in combination with non-equilibrium Green's function approach. The results show that a wide range of thermal conductance tuning can be realized by changing the chemical bond strength and atom mass of the bridge atoms. It is found that the chemical bond strength (bridge atom mass) plays the main role in phonon scattering at low (high) temperature. A simple equation is presented to describe the relationship among the thermal conductance, bridge atom, and temperature. 相似文献
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本文分析了目前测交流电致发光屏功耗通用的补偿法所存在的问题,并通过计算导出此法适用的范围.在此基础上设计了交流电桥法,直接测量发光屏等效电阻和等效电容,通过等效电阻计算发光屏功耗.这样,克服了补偿法存在的问题,并在一定程度上消除了发光屏非线性阻抗特性对功耗测量的影响. 相似文献
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本文探讨了串联电阻型非平衡电桥温度设计中串联电阻与桥路电流、桥臂电阻的关系,并说明了串联电阻、桥路电流及桥臂电阻间的相互影响。 相似文献
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目前我们往往测绘模拟静电场的电位绝对值分布图,但该分布不是唯一与稳定的。若引入相对电位K的概念,则使该分布模拟静电场的特征规律──决定各"等K面"的几何参数与两源电极间的总电势差的绝对值大小无关."T型数字电桥盒"不仅能使测绘"等K面分布"实现"数字化的直接显示",而且它还类同箱式电桥那样可用于"惠斯登电桥"实验,前者优胜于后者。 相似文献
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本文研究外加电场对离子交联聚乙烯的微观结构和能量特性的影响,使用分子模拟法建立PbO作硫化剂的交联聚乙烯分子模型,通过半经验法对模型进行几何优化同时施加沿X轴方向的外电场,计算离子交联聚乙烯的分子总能量、偶极矩、极化率、分子轨道能量、能隙、红外光谱、电荷分布并进行分析.得出结论:随着外加电场的上升,交联聚乙烯分子结构会发生变化,当外加电场过大时本文所建交联聚乙烯分子离子盐桥的S-Pb-S键将会发生断裂形成自由基.外加电场会使分子内部的电荷从交联聚乙烯碳链端部向离子盐桥转移,盐桥处Pb原子电荷量不断积累,到达临界点时将会断裂形成电荷量较大的Pb自由基,在外加电场的作用下进一步影响交联聚乙烯分子的稳定性导致其性能下降,研究结果对交联聚乙烯的电树枝老化生成提供参考. 相似文献