基于光纤布拉格光栅和放大基片的高灵敏度微位移传感器（英文）

提出了一种基于光纤布拉格光栅(FBG)的微位移传感器。该器件由一对中心波长不同的光纤布拉格光栅和一个杠杆结构的金属衬底组成,布拉格光栅采用飞秒激光相位掩模法制作。被测物体的位移由杠杆结构放大,并转换为布拉格光栅的轴向拉力。通过理论分析和有限元模拟获得的放大系数分别为2.67和2.5。实验结果表明,在0至50μm范围内,光纤光栅中心波长的偏移与被测物体的位移呈线性关系,位移灵敏度达到121 pm/μm。级联的布拉格光栅可用于温度补偿。     

光纤光栅位移传感技术研究

介绍了一种光纤光栅传感器的在曲面空间位移测量方面的应用.随着外界应力的变化,光纤光栅的Bragg中心发射波长将发生相应的移动.利用此特性,提出并实现了一种精密的用光纤光栅作为敏感元件测量曲面空间间隙位移的方法,获得了光栅Bragg波长偏移量与曲面间隙位移量之间的曲线关系,其灵敏度可达3.5013 nm/mm,最后对实验结果进行了分析.     

一种适合工程应用的新型光纤光栅位移传感器

针对全光纤结构健康监测系统中对位移监测的需求,基于光纤光栅传输理论,依据工程结构实际位移监测要求,研制出一种结构简单新颖、位移测试精度高、具有温度自补偿、满足结构长期位移监测的新型光纤光栅位移计.并且对其灵敏度系数进行了标定.从实验结果来看,光纤光栅的波长变化与位移存在很好的线性关系,并具有很好的重复性,相对于解调仪的精度,所设计传感器的精度为0.08mm,相关系数达到0.999以上.     

一种新型灵敏度可调式光纤光栅传感器

以光纤光栅为敏感组件,设计了一种嵌入式等强度悬臂梁结构的灵敏度可调式光纤光栅传感器．将传统的感测片长度固定的传感器架构设计为感测片部分嵌入主架构的传感器,通过改变悬臂梁感测片长度来达到灵敏度调节的效果．由理论分析和振动、位移灵敏度调节实验验证,此传感器装置可以达到调节灵敏度的效果,而且可调节范围较广．     

光纤光栅传感器的应用实验

本文阐述了光纤光栅传感器的基本特点,并给出了光纤光栅传感器的实际应用实验,对存在的问题及解决途径进行了介绍。     

光纤布拉格光栅渗压传感技术研究

基于光纤光栅传感技术，提出了一种新型的光纤光栅渗压传感器设计方法，有效地解决了传感器研制过程中的关键工艺技术，建立了系列光纤光栅渗压传感器的设计模型，将研制的该种传感器应用于工程实际，取得了良好的应用效果。研究表明，光纤光栅压力传感器具备良好的重复性、线性度和灵敏度，可以满足实际应用的要求，具有广阔的应用前景。     

混凝土结构内的螺旋线微弯增敏光纤传感器

本文介绍一种适于埋入混凝土结构内的螺旋线微弯增敏光纤传感，描述其工作原理，并给出与光时域变换技术结合运用的实验结果。     

反射式光纤位移传感器的研究

本文主要致力于反射式光纤位移传感器的研究。给出了光纤位移传感器的具体的设计方案,即根据光纤反射调制原理进行了反射式光纤位移传感检测系统的设计,采用计数器外径干分尺的测头镜面作为反射体和位移测量工具,分析了位移测量装置和传感器检测电路。实验表明,在0～2mm范围内检测系统的输出与位移成线性关系,灵敏度为196μV/μm,线性度为26％。适于微位移的测量。     

光纤光栅及其在传感器中的应用

采用耦合波理论分析了光纤光栅对光的反射机理及其传感原理,提出了光纤光栅在温度测量和位移测量中的应用方案,给出了实验结果,展望了光纤光栅在光纤传感和光纤通信方面的应用前景.     

光纤光栅及其在传感器中的应用

采用耦合波理论分析了光纤光栅对光的反射机理及其传感原理,提出了光纤光栅在温度测量和位移测量中的应用方案,给出了实验结果,展望了光纤光栅在光纤传感和光纤通信方面的应用前景.     

基于平面膜片温度压强同时测量的光纤光栅传感器

提出一种基于膜片的双光纤Bragg光栅实现温度与压强同时区分测量的光纤光栅传感器．分别将光纤Bragg光栅沿膜片的径向和环向粘贴在膜片上,当温度发生变化或者膜片受到压力作用时,都会引起光纤Bragg光栅蜂值波长偏移．由于温度的变化所引起的两栅波长偏移量是相等的,此时两光纤Bmgg光栅波长偏移量之差完全取决于膜片所受的压强,据此可以实现温度与压强的同时区分测量．该传感器线性度很好,可以用来同时区分测量温度在40～110℃,压强在0～6MPa环境中的温度和压强,其温度测量误差不大于1℃,压强测量误差不大于0．2MPa．     

基于倾斜光纤光栅的相对湿度传感器

提出了一种基于倾斜光纤光栅(TFBG)的包层上覆盖着聚乙烯醇(PVA)的空气相对湿度传感器,成功实现了对相对湿度在20～98%RH范围内的监测。研究发现,TFBG的透射功率在20～74%RH和74～98%RH2个相对湿度区域内分别呈现不同的线性变化,敏感度分别为2.52 dBm/%RH和14.95 dBm/%RH,并且在高湿度区有更高的敏感性。     

光纤光栅冰力传感器的开发及应用

根据裸光纤光栅(FBG)对应变的灵敏度远高于对压力的灵敏度这一特点,设计了一种基于等强度梁结构的FBG冰力传感器,并可以通过调节封装构件的尺寸调节其测量压力的灵敏度系数。对传感器的标定结果显示,这种FBG冰力传感器的线性相关度良好,实测的灵敏度系数与理论值一致。该种传感器在冰激桥墩振动模型试验中得到了应用,成功监测了桥墩在不同冰速撞击下受到的冰力。实验表明,这种FBG传感器灵敏度高、可靠性好、对结构自身的影响很小,可直接测量冰的撞击力,适合于模型实验中的冰力监测。     

基于C形弹性管的光纤光栅压力位移传感测量

设计了一种基于C形弹性管的光纤布喇格光栅传感结构．用管内过剩压力使弹性管的自由端产生位移和管表面产生的应力对光纤布喇格光栅反射波长进行调谐．得到了光纤布喇格光栅反射波长变化对应于压力和自由端位移的线性关系．在0～6MPa的压力范围内,光纤布喇格光栅反射波长随压力和位移均呈线性变化且压力和位移的传感灵敏度分别达到0.0305nm/MPa和0.0359nm/mm,线性调谐范围分别为0.183nm和0.215nm,波长分辨率分别为3.05pm和0.718pm．     

A novel optical filter of fiber Bragg grating

A theory of a novel optical filter of drawing the fiber Bragg grating by the heated elastic sheet is advanced. Based on the heat conduction equation, a set of func- tions of temperature and thermal expansion on the heated elastic sheet are calculated. And the most displacement of the heated elastic sheet is also described. Finally the ex- pression of the reflected Bragg wavelength deviation in terms of the thermal power density of heat-source is deduced. The physics feasibility of these conclusions mentioned above is proved. It is a potential value for the novel optical filter to research.     

Digital monitoring for heavy duty mechanical equipment based on fiber Bragg grating sensor

The digital monitoring principle and technologies for heavy duty mechanical equipment based on fiber Bragg grating (FBG) technology are introduced in this paper. The fundamentals of new-style FBG sensing technology, including the photorefractive effect of FBG, the physical formation, and the relation between optical properties and grating parameters, are investigated. The plaster, encapsulation and distribution planning of FBG sensor (FBGS), which is used to monitor heavy duty mechanical equipment under abominable environment and extreme conditions, are also studied. In addition, theoretical and experimental researches on the strain, temperature, displacement, and stress transmission characteristics between FBGS and detection interface are presented. The principle and method for temperature compensation in non-uniformity temperature field are described in detail as well. Comparing with the traditional sensing monitoring techniques, the application of FBGS technology on digital monitoring and diagnosis for heavy duty mechanical equipment has a number of significant technical advantages and will make a new breakthrough in this field.     

基于方向耦合器的光纤光栅法布里—珀罗腔

分析了基于方向耦合器的光纤光栅法布里—珀罗腔的特性 ;讨论了腔长 ,方向耦合器的耦合系数及光纤光栅反射谱宽等因素对输出谱线的数目和谱宽的影响 ;给出了单模输出的腔长     

Characteristics of Smart Concrete with Fiber Optical Bragg Grating Sensor

Based on the adrantages of the fiber Bragg grating sensing technology, this paper presents a principle of a novel smart corwrete with fiber optical Bragg grating sensor, analyses the theory and characteristics,illustrates the key technology and method to make the fiber Bragg grating sensor for the smart concrete, and proves the feasibility with experiments.The results inlicate that the smart concrete with fiber Bragg grating sensors is feasible in the structure monitoring and damage diagnosing in the long run.     

Temperature and humidity sensor using the multimode fiber cascaded Bragg grating

In order to design an optical fiber sensor with a simple structure which can simultaneously measure temperature and relative humidity, we use the multimode fiber cascade Bragg grating to form the basic structure of the sensor. First, a 6mm multimode fiber is connected to a Bragg grating. Then the diameter of the multimode fiber is etched to 40μm by hydrofluoric acid. Finally, a layer of carboxymethyl cellulose hydrogel is coated on the multimode fiber. The temperature and humidity response of the fabricated optical fiber sensor is tested. Experimental results show that the designed sensor has a humidity sensitivity of 69.6pm/% RH and a temperature sensitivity of 15pm/℃. The designed sensor is very sensitive to temperature and humidity, and has a good application prospect.