全光型大电流光纤电流传感器

本文中综合论述了光学电流传感器的特点、历史发展及现状,及两种基本类型的光学电流传感器,着重研究了其中最有希望实用的磁光材料型光学电流传感器的传感机理。     

一种基于泡克尔斯效应的光学电流传感方法

利用空芯电流互感器和电光晶体实现了工频电流的光学传感与测量,对工频电流－电压变换方法和二次电压的光学传感进行了理论与实验研究。结果表明,这种方法具有线性和同相位传感特性,并能够有效地避免铁芯电流互感器存在的波形失真及磁饱和问题。对０￣１０Ａ工频电流传感实验结果的非线性误差低于１．３％。     

多环光路结构光学电流传感头研究

增加环绕电流的光束环路数是提高法拉第效应光学电流传感器灵敏度的主要方法，本文介绍了利用正交双全反射保偏原理设计的双环路及多环路传感头结构，并对双环结构进行了实验测试 。     

SO_2传感技术研究进展

SO2是一种重要的大气污染物质,开展SO2监测技术研究对于环境保护有重要意义。介绍了近年来SO2气体监测方法中有关电化学传感和光学传感技术的研究进展,比较了各种传感方法的特点,并指出SO2传感技术发展方向。     

光学电流传感头结构设计􀀁

本文阐述了光学电流传感器（ＯＣＴ）的设计原理及两种三角形传感头结构的设计方法。这类结构光路简明,光程短,反射面少,光路调整容易,光耦合效率高,并且光路闭合完全。     

光学电流传感器灵敏度的提高

利用法拉第磁光效应可构成光学电流传感器（ＯＣＴ）。选择高Ｖｅｒｄｅｔ常数的传感材料，增加光束环绕电流的环路数是提高ＣＣＴ灵敏度的主要方法。采用比较测量法来消除温度对高Ｖｅｒｄｅｔ常数铁磁材料的影响，介绍了反向双环路结构传感头，并对其进行了实验测试。     

实用的光纤电流传感器

提出了一种结构小巧（体积为3cm×4cm×1．5cm）、使用方便的光纤电流传感器．该系统的传感头是以Sagnac干涉仅原理为基础，利用法拉第光学材料作为传感元件，经过巧妙的结构设计构成．传感头不含有任何与们振有关的光学元件，并且待测的信号与光的偏振态和光强的起伏无关，使得该传感系统特别适用于电流遥测使用．初步实验结果和理论结果吻合．     

光纤光度计远程应用时的信号强度

一、概述光导纤维及其应用是现代新技术革命中的一个重要领域,研究光导纤维传递光、信息和图象的科学称为纤维光学。纤维光学是继集成光学之后近代光学的又一分支。在传感技术领域中,随着新技术、新材料、新工艺的不断采用,各种新型的传感器相继问世,光纤化学传感器是近年来异军突起的一项新的传感技术。光纤化学传感器又叫光极(optrode),这一新的术语是由“optical”(光学的)和     

光电互感器技术分析

光电互感器以光电子技术和光纤传感技术基础,以更优越的性能来适应现代电力工业对电压等级以及电流质量的不断提高,它逐渐取代着传统的电磁式互感器,包括光学电流互感器（OCT）,光学电压互感器（OVT）和组合式光电互感器。本文主要介绍了光学电流、电压互感器的工作原理,现存问题以及目前的解决方法,光电互感器在现代电力工业中的部分应用,并展望了光电互感器的发展趋势。     

电流传感器接口在电动汽车电池管理系统中的关键性作用

影响电动车使用增长率最大的因素是电池,而对电池整体性能有着关键性影响的便是电池传感器.本文将介绍电池传感器技术的进步对提升电动车电池性能的重要作用,对电流传感进行详细探讨,比较不同的传感技术以及各自的优缺点,同时介绍了AS8510的性能及在电动车中的应用.     

智能材料和智能结构(3)——智能结构的设计、控制和探测

智能结构是当代最具挑战性、最活跃的新研究领域之一。智能结构技术包括材料设计、高等执行和传感技术、自适应计算机算法和能量利用最佳化。智能结构的应用范围从空间飞行器和飞机到大型民用建筑和桥梁。本文综述了智能自适应光学系统波前传感器的设计、智能mm波望远镜的表面控制和振动抑制、智能建筑物层间漂移的激光叉丝监测、智能圆柱形结构应变的光纤光栅测量系统和智能结构的长周期光栅传感器。     

Optical VOCs detection using poly(3-alkylthiophenes) with different side-chain lengths

The use of conjugated polymers in the gas and volatile organic compounds (VOCs) detections represents an advance in the development of the electronic noses. Polythiophenes show good thermal and environmental stability, are easily synthesized and they have been studied as gas and VOCs sensors using different principles or transduction techniques. Among these techniques, optical sensing has been attracted attention, mainly due to its versatility. However, conjugated polymer-based optical sensors are still less studied. This paper describes the use of two poly(3-alkylthiophenes) for VOCs optical detection. The sensing measurements were carried out using visible spectroscopy. Both polymers showed good sensitivity to the VOCs, showing fast and reversible responses with some hysteresis, and were unable to detect hydroxylated samples. Furthermore, it was demonstrated that the thickness of polymer films influences the intensity of the optical response. Although there is similarity in the superficial composition of the polymers films, demonstrated by their surface energies, they showed significant differences in their optical properties upon exposure to the VOCs.     

Review Article Hyperspectral geological remote sensing: evaluation of analytical techniques

Improvements in optical remote sensing spectral resolution and increased data volumes necessitates the development of improved techniques for quantitative geological analysis. Laboratory spectral studies indicate that absorption band positions, depths and widths are correlated with diagnostic physicochemical mineral properties such as composition and abundance. Most current analytical techniques are incapable of providing comprehensive quantitative analysis of hyperspectral geological remote sensing data. Factors which must be considered for hyperspectral remote sensing campaigns include spectral resolution, analytical technique, band pass positions and spatial resolution. In many cases the volume of data required to address specific issues can be reduced through intelligent selection of band passes and analytical techniques.     

基于多模光纤强度调制的扰动定位传感器

介绍了一种采用模式耦合原理的强度调制型扰动定位传感器.传感光纤为多模光纤.光在传感光路中沿相反的方向传播,分别由两个探测器接收,通过计算扰动信号到达两个探测器的时间差,可以得到扰动的位置.本文分析了其传感原理、定位原理及影响定位精度的因素,通过采用宽谱光源、数字滤波等方法使定位精度提高到约±100 m.所述方案定位精度高、结构简单、传感距离长,适用于长距离管道监测、安全防卫等各种扰动传感领域.     

水下爆炸压力传感器技术研究综述

压力是水下爆炸测量的重要参数,相应的传感器技术决定了整体压力测试水平的高低,因此有必要对水下爆炸压力传感器技术的应用及发展现状进行总体性的把握;首先从传感器敏感元件的选择、国内外在中远场、近场压力测量技术等方面概述了自由场压力传感器技术的发展现状,并指出了现在自由场压力测量中存在的一些问题;其次,论述了结构物表面压力测量技术的研究进展,总结了测试难点及对传感器性能要求,并对目前的测试现状进行了评述,指出了结构物表面压力测量传感器技术的发展方向;最后,对水下爆炸压力传感器技术进行了总结并提出了发展趋势。     

光纤水质传感器的研究现状和发展趋势

论述光纤传感技术在国内外水质监测中的应用与技术现状,介绍光纤传感技术监测水质的原理和技术方法,并按照非功能型和功能型分类分析典型光纤水质传感器的原理和技术,包括水质的pH值、溶解氧浓度、浊度、重金属离子污染等水质监测指标,涵盖了光吸收散射方法、荧光标示方法、SPR效应技术以及倏逝波技术方法等典型方法。最后指出光纤水质传感的技术发展趋势。     

Low temperature gas sensing applications using copier grade transparency sheets as substrates

Transparency sheets, coated with copper on both sides by means of thermal evaporation in vacuum, are patterned by direct chemical etching to realize sensing platforms having copper heaters on the backside, and resistances having calibrated temperature coefficient on the topside. The mechanical and thermal stability of these structures was demonstrated up to 70 °C. Bending tests also show that the metallic patterns do maintain unaltered performances after more than 10⁴ bending cycles. Resistance measurements show that the resistance on the patterned copper structures linearly increases with the temperature in the range between room temperature and 70 °C, while above this temperature an irreversible damage occurs. Experimental investigations demonstrate that the heaters on the backside of the sensing platforms allow to obtain a quite uniform temperature distribution on the top side over an area larger than 1 cm².Coating the flexible sensing platform by doped polyaniline and carbon nanotubes embedded in a polymer host, a chemoresistive system operating at low temperature is developed, which allows to perform tests at constant temperature, with the temperature being set and monitored by using the heater and the patterned resistance, respectively. The sensing performances of the films are evaluated by means of electrical measurements performed while exposing the samples to different relative humidity levels, and to calibrate ammonia pulses.     

一种新型精密光纤位移传感器

本文论述了一种新型基于垂直干涉的位移传感器 ,该装置在麦克尔逊干涉仪的基础上 ,采用了一个臂 ,参考光与信号光共用一条光纤路径 ,气隙距离为待测距离。系统抗干扰能力很强 ,结构简单。分辨率为 5 nm。     

运动传感驱动的3D直观手势交互

为了使手势交互方式较少受到场地和光线的限制,提出利用加速度传感器作为输入设备进行手势识别的方法.对每种手势只要求用户做一次示范表演,通过添加噪声等手段来提高训练数据生成的自动化程度;将训练数据经过预处理和特征提取之后用于训练机器学习模型(隐马尔科夫模型和支持向量机).在包含70种手势的测试集上进行实验,平均识别率超过90%;并开发了幻灯片手势控制和手势拨号2个基于手势的人机交互原型系统,结果表明文中方法能够显著地提升用户在人机交互中的体验.     

Recent advances in optical current-sensing techniques

The Faraday effect is becoming widely used as an optical method of measuring electric current or magnetic field. It is particularly advantageous where the measurements must be made at high voltage or in the presence of electromagnetic interference, and where speed or stability are considerations. In this paper, the present state of research into Faraday-effect current sensors is outlined, eight possible approaches for overcoming the problems associated with the linear birefringence inside the fibres of optical current sensors are simply introduced, recent advances in this area are reviewed, and possible prospects are considered.