Magneto—optic Current Sensor Based on Total Reflections in a Quadrangular Bulk Glass

A novel optical device of a bulk glass Faraday current sensor in presented,which has a accuracy of 0.5 in the current region of 1000-8000A and over a tempe-rature range from-30℃ to 40℃.The new sensing device can compensate the phase difference heteween p and s components of the incident light caused by total internal re-flections in a glass.The self-correction,auto-correlation and auto-ampification tech-niques are used in the signal treatment with the help of a computer.     

High Voltage Breaker Current Monitoring and FaultDiagnosis System Based on Fiber Current Sensor

Abstract: The current measuring principle, the hardware structure and the software functions of a high voltage breaker current monitoring and fault diagnosis system are introduced. A simple algorithm for calculating the current effective value is given. The cut - off characteristics of the breaker are classified. This system can provide a foundation for reasonably determining the breaker service period.     

New Compensated Method to the Phase for a Bulk Optic Faraday Current Sensor

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New Compenated Method to the Phase for a Bulk Optic Faraday Current Sensor

A new method to reduce the reflection-induced phase between the two ortho-gonal components of the linearly polarized light after the reflections is presented.This kind of sensor haad essier to fabricate and adjust than that whose internal reflection is at critical angle.     

Miniaturized Heat-Flux Sensor Based on a Glass-Insulated Bi–Sn Microwire

Semiconductors - Thermoelectric-energy conversion based on a single element made of an anisotropic material is considered. In such materials, the heat flux generates a transverse electric field. We...     

Photoelastic Fabry－Perot Optical Modulator Based on a Silicon－on－Insulator Structure

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Fiber Bragg Grating Pressure Sensor Based on Corrugated Diaphragm

A kind of fiber Bragg grating pressure sensor based on corrugated diaphragm is proposed. The relationship between the central wavelength of reflective wave of FBG and pressure is given, and the expression of the pressure sensitivity coefficient is also given. Within the range from 0 MPa to 0.3 MPa, the experimental pressure sensitivity is 7. 83 nm/MPa, which is 2 610 times than that of the bare fiber grating. The experimental results agree with the theoretical analysis. It is indicated that the expected pressure sensitivity of the sensor can be obtained by optimizing the size and mechanical parameters of the corrugated diaphragm.     

Effect of a Nanodimensional Polyethylenimine Layer on Current–Voltage Characteristics of Hybrid Structures Based on Single-Crystal Silicon

In this paper the study of the tunneling current–voltage (I–V) characteristics of silicon surfaces with n- and p-type conductivity as a function of roughness in the presence of an adsorbed insulating layer of polyethylenimine (PEI) is presented. A new approach is proposed for analysis of the tunnel current–voltage characteristics of a metal–insulator–semiconductor structure based on the combination of two models (Simmons and Schottky). Such joint analysis demonstrates the effect of surface states and evaluates changes in the band bending and electron affinity after the deposition of the polyelectrolyte layer on the semiconductor surface. As a result, we are able to differentiate between the equilibrium tunnel barrier (qφ ₀) and the barrier height (qφ _B). It is shown that the deposition of the polymer leads to an increase of the equilibrium tunnel barrier by more than 250 meV, irrespective of the roughness and the conductivity type of the silicon substrate. The PEI deposition also leads to changes in the barrier height (less than 25 meV) that are smaller than the equilibrium tunnel barrier changes, indicating pinning of the Fermi level by the electron surface states that are energetically close to it. These surface states can trap charge carriers, a process leading to the formation of a depletion region and band bending on the semiconductor surface. Moreover, the change in the barrier height qΔφ _B depends on the conductivity type of the semiconductor, being positive for n-type and negative for p-type, in contrast to qΔφ ₀, which is positive for all substrates. The change is explained by capture of electrons preferably from the semiconductor space-charge region in the presence of a cationic polyelectrolyte, e.g., PEI.     

Embedding a Signature in an Image Based on Fractal Compress Transformations

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Design of an OP-AMP Based on a LDO Regulator

An operational amplifier (OP-AMP) with a ground current of about 0.6μA is presented.Moreover,this amplifier reaps the benefits of incorporating a foldback current limiting circuit,which enables the low-dropout voltage regulator without the need of a special current limiting subblock.Therefore,the object of ultra-low power is realized because of a great reduction in transistors and current limbs.     

High Voltage Breaker Current Monitoring and Fault Diagnosis System Based on Fiber Current Sensor^①

The current measuring principle,the hardware structure and the software functions of a high voltage breaker current monitoring and fault diagnosis system are introduced.A simple algorithm for calculating the current effective valus is given.The cut-off characteristics of the breaker are classified.This system can provide a foundation for reasonably determining the breaker service period.     

高灵敏度的光磁式电流传感器

介绍了结构上带气隙的园环铁芯,采用新型传感元件设计的法拉第效应光磁式电流传感器.该传感器元件是一块经过精细研磨的玻璃棱镜,棱镜的两端面有高反射能力的镀层,经棱镜传播的光束在玻璃/空气界面上会进行20次的临界反射.新设计的电流传感器,其灵敏度比基于类似原理的原设计产品几乎高3倍.     

利用平衡测试原理的光纤电流传感器

本文利用法拉第效应提出一种干涉型光纤电流传感器，使用平衡测试原理具有闭环反馈结构。它的主要优点是能够有效地消除费德尔常数和环境变化对传感器的不良影响，电流测量范围大，线性度好，在电力系统中有广泛的应用价值。     

高灵敏度温度稳定BiGd：YIG磁光光纤电流传感器 性能及其晶体生长研究

法拉第磁光光纤电流传感器因其具有结构简单、安全可靠、高精度和灵敏度等优点而受到国内外的广泛关注。法拉第传感材料的磁光性能对于光纤电流传感器的性能有重要的影响。本文用熔盐法生长了高法拉第旋转角、温度稳定的稀土铁石榴石磁光单晶BiGdYIG,测试分析了其在近红外波段的磁光性能及其温度特性。其法拉第旋转角θ     

A Passive Optical Fiber Current Sensor Based on YIG

A research on passive optical fiber current sensor based on magneto-optical crystal and a new design of light path of the sensor head are presented. Both methods of dual-channel optical detection of the polarization state of the output light and signal processing are proposed. Signal processing can obtain the linear output of the current measurement of the wire more conveniently. Theoretical analysis on the magnetooptical fiber current sensor is given, followed by experiments. After that, further analysis is made according to the results, which leads to clarifying the exiting problems and their placements.     

基于DSP的光纤电流互感器二次侧信号处理

用TMS320F206实现了有源式光纤电流互感器二次侧输出信号的处理，包括真有效值（RMS）的计算、互感器低压侧显示仪表的实现和电力系统继电保护的数字接口的实现等，给出了硬件设计和软件设计方法。     

块状光学材料电流传感器研究新进展

主要介绍了块状光学材料电流传感器研究领域自１９９４年以来在传感头设计方案、理论研究及信号处理方案等方面的新进展。     

一种光纤电流传感器的设计

针对交流电的特点和传统测试仪器的缺点,以法拉第效应为理论基础,设计了一种光纤电流传感器,介绍了该传感器的工作原理、结构和测试结果.实验结果表明,该电流传感器能准确测量30kA电流,为生活中的大电流测试提供了一种切实有效和更便利的方法.