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设计并实验实现了利用单块硅酸铋(Bi12SiO20,BSO)晶体同时测量交流电压和电流的传感方案,其光学传感单元仅由起偏器、BSO 晶体和检偏器组成。BSO 晶体兼有Pockels 电光效应和Faraday磁光效应,在起偏器和检偏器的主透光方向互相平行或互相垂直的情况下,输出光信号中同时包含被测电压和电流传感信号,其中电压传感信号为被测电压的倍频信号,而电流传感信号则与被测电流同频率,因而可以利用电子滤波器从光电检测信号中分离出电压与电流传感信号,从而实现电压和电流的同时测量。利用一块尺寸为6.04.02.9 mm3 的BSO 晶体,实验实现了6 A、200 V 范围内工频电流与电压的同时测量。 相似文献
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用BSO晶体传感器测量材料霍耳系数的研究 总被引:1,自引:0,他引:1
硅酸铋 ( BSO)晶体具有泡克耳斯效应和法拉第磁光效应 ,利用通过 BSO晶体的偏振光将被电场和磁场调制的特性 ,设计一种 BSO晶体传感器用于测量金属的霍耳系数 相似文献
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基于BSO的液晶空间光调制器 总被引:2,自引:1,他引:1
紫外光敏材料硅酸铋(BSO)在短波长的蓝紫光激励下电阻率会急剧降低,可作为良好的光信息写入材料,用作光寻址的液晶空间光调制器(LC-SLM)的感光层.介绍了以BSO为基的光寻址透射式液晶空间光调制器的结构和工作原理,从BSO晶体产生光电导效应的机理出发,得到了光电流和光照功率的关系.实验测量了BSO晶体片在不同频率和不同强度的光照下的光电响应.通过对液晶分子指向矢分布随电压变化的理论计算,得到了在不同光照强度下BSO基的液晶空间光调制器产生的光程差,与实验中液晶盒在不同电压下产生的光程差有相同的变化趋势. 相似文献
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基于水热法生长的硅酸铋晶体光学电压传感器 总被引:1,自引:1,他引:0
提出一种基于水热法生长的硅酸铋(BSO,Bi12SiO20)晶体型光学电压传感器,其电压传感单元主要包括一块BSO晶体和两个偏振器,不需要附加1/4波片。实验结果表明,所用BSO晶体样品具有显著的线性电光效应,可以用于测量交流电压;通过合理利用BSO晶体自身自然旋光性,可以使其电压单调及线性测量范围均大于以往基于无自然旋光性晶体的电压传感器。实验所用BSO晶体的自然旋光角度约为132°。实验数据表明,在电光相位延迟的峰-峰值为2π范围以内,传感器输出电压仍然能够随被测电压单调地变化。在被测工频电压有效值为108~1300V范围内,实验测量了传感器输出电压随被测电压变化的非线性响应特性;在利用应力双折射产生的相位延迟提供光学偏置的条件下,在一定电压范围内,可以实现工频交流电压的线性测量,相应的电压测量灵敏度约为0.027 6mV/V,非线性误差小于3.1%。 相似文献
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提出一种使用同一晶体测量电压、电流、电功率的光传感新原理,并在实验上作了验证.简单的分析表明,适宜这种原理的晶体点群只限有8组,它们具有电光效应、旋光性和法拉第旋转效应,适用于这种原理的实际晶体有石英和BSO(硅酸铋)晶体,BSO最适宜这种原理,这是因为它易于光学调整,并且有很好的温度稳定性,用石英和BSO晶体进行的实验表明,与理论的一致性很好. 相似文献
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《III》1998,11(4):36-38
Hall effect measurements are an important means of quality control in the use of SI-GaAs wafers. Recent round-robin testing by Japanese substrate suppliers has been aimed at reducing the error from finite contacts, as a step towards standardization of Hall effect measurements. 相似文献
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An analogue computer simultaneously using Hall effect and magnetoresistance effect is described. The different states of operation of the computer and the performed mathematical operations are tabulated. The characteristics of the device are presented. 相似文献
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The research that led up to the discovery of the Gunn effect is described by the author. A brief explanation of the effect is given, and the present use of Gunn diodes is also indicated 相似文献
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A new physical mechanism, active in the base region of dual-collector lateral bipolar tranistors in the presence of a transverse magnetic field, is described in the letter. This mechanism induces a differential current flow from the two collectors, and is also responsible for an increase in the overall current gain. 相似文献
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《Electron Devices, IEEE Transactions on》1968,15(10):777-788
In view of the rapidly expanding interest and activity in the area of the Gunn effect, the following bibliography has been compiled for people who are studying or doing research in this area. The term "Gunn effect" is used, in general, to collectively describe a number of classes of bulk negative resistance behavior in semiconductors with energy band structures like that of GaAs. These modes of behavior include small-signal amplification, pure accumulation of space charge, mature dipole (true Gunn effect) mode. quenched accumulation (LSA) mode, and quenched dipole mode. These references deal with the theory, experimental results, and applications of the Gunn effect. Works of a fundamental nature concerning phenomena that are basic to all semiconductor behavior and other bulk negative resistance effects have not been included. Also, basic papers dealing with electron transport phenomena, such as hot electron theory and intervalley scattering, which are essential to a complete understanding of the Gunn effect and articles on the properties and band structure of GaAs, InP, CdTe, and other III-V compounds have not generally been included, although in certain cases they are listed if they have been frequently cited. As in the compilation of any bibliography, it is self-evident that some valuable and pertinent articles may have been overlooked. 相似文献