光纤光栅用于混凝土结构应变模态检测的研究

光纤Bragg光栅传感技术是一种先进的技术，具有传统技术无可比拟的优势。损伤检测研究是一个跨学科的前沿研究领域，传感技术的发展必将推动混凝土结构损伤检测新技术的研究与应用。本文介绍了光纤Bragg光栅传感技术原理，阐述了基于光纤Bragg光栅传感技术和应变模态理论的损伤自诊断的基本原理，并进行了相关的混凝土结构的可行性实验研究。结果表明光纤Bragg光栅传感器抗干扰能力强，具有高灵敏度和长期稳定性，其作为应变测量的工具用于应变模态，进行混凝土结构损伤识别是可行的。     

集成光纤陈列用于复合材料冲击与振动的检测

本文提出了一种新颖的、可埋入复合材料与结构内探测结构内部状态参数的、结构简单的刻纹光纤传感器陈列，并将其集成入教－１１飞机的层合复合材料垂直尾冀试件内，对结构所受冲击与振动进行检测，实验结果显示了该方法的可行性。     

光纤光栅传感器在道路测试及工程应用的研究进展

路面结构内部温度、湿度、应力和应变等参数的测试一直是道路测试领域的重点和难点,随着光纤光栅传感技术的发展,为道路测试领域提供了新方法;为了论证光纤光栅传感技术在道路测试领域的可行性,介绍了光纤光栅传感系统的基本结构,从温度和应变传感器基本原理出发,综述了光纤光栅传感器的室内探索性研究和在实际路面温度和应变测试的成果.最后介绍了光纤光栅传感器在其他工程,包括桥梁、隧道及机场跑道中的应用情况,并分析了光纤光栅在道路测试工程中推广使用所面临的困难和发展方向.     

光纤光栅智能混凝土材料与结构试验技术的研究

结合光纤光栅传感技术的优点，提出了一种光纤光栅智能混凝土材料与结构试验技术，并对该技术进行了分析，阐明了光纤光栅智能混凝土材料与结构试验的关键技术和方法，并通过原理性实验得以验证。光纤光栅智能混凝土材料与结构试验技术在结构的长期状态监测和损伤诊断方面具有良好的前景。     

墙地砖表面平整度自动连续检测技术

墙地砖表面平整度自动连续检测采用光纤传感器测量采集数据，利用微机进行数据处理，评定等级，并输出分选控制信号，实现自动分选，码垛。该技术的使用，有利于提高检测效率，减少漏检率和保证检测精度。     

基于OTDR技术的光纤式输油管道安全预警系统

提出一种基于光时域反射原理(0DTR)和分布式光纤传感原理实现输油管道泄漏安全实时监测的技术.当输油管道发生泄漏时,使光纤所处的温度场发生变化,利用光纤后向喇曼散射的温度效应测量该处的温度变化来判断管道泄漏;当发生人为破坏(盗油)事件时,所产生的振动、压力等扰动信号使在光纤中传输的后向瑞利散射光产生明显的变化特征,通过测量其光强的变化来检测管道是否受到扰动或破坏.用ODTR技术实现对光纤测量点的定位.实验结果表明,系统已达到的主要技术指标:光纤长度5 km(可延长),测温范围0-90℃(可扩展),温度测量偏差小于 5℃,对扰动外力和温度的定位偏差小于15 m.该检测技术可以有效地提高输油管道泄漏监测和防盗油水平.     

弹性体结构光纤光栅应变传感器的设计与性能研究

为提高光纤光栅传感器的精度和长期使用稳定度,在分析其应变响应机理和研究现状的基础上,设计基于应变弹性体封装的光纤光栅应变传感器,封装材料采用305不锈钢。力学传递原理和Ansys力学分析结果都表明:该传感器能够有效地通过弹性结构将应变传递到光纤光栅上。利用激光切割技术制作不锈钢光纤光栅传感器封装壳体,在-2 000~2 000με的测量范围内,实验测得其应变灵敏度为1.21pm/με、线性度达0.999 6、检测精度不大于1με、稳定度不大于±3με。     

武工大成功研制光纤光栅传感器

主要应用于石油化工行业的光纤光栅传感技术 ,日前在武汉理工大学研制成功 ,并获得湖北省科技进步一等奖 ,为我国石化业重大工程的安全检测提供了有力的保证。武工大研制的光纤光栅传感器除了具有普通传感器的本质防爆、抗电磁干扰外 ,还可实现现场无电检测 ,从本质上排除了一般光强型传感光信号传输中各种光强起伏引起的干扰 ,避免了一般干涉型传感器中相位测量的不清晰和对固有参考点的需要。该技术在一根光纤中串换多个光栅进行分布式测量 ,构成各种形式的光纤传感网络 ,因此可对大型油罐内部的温度变化进行高分辨率和大范围的测量。目前…     

光纤传感器的研究与应用

阐述了光纤传感器的特点、结构原理及综合应用.介绍了光纤传感器测井的优点,并论证了光纤传感技术以其独特的优势取代传统电子传感技术的发展趋势.     

光纤传感及其在管道监测中应用的研究进展

管道安全关系到人类生命和财产安全,及时掌握管道结构健康状态是确保管道安全运行的重要前提。光纤传感技术的不断发展,使其在各个领域得到广泛研究与应用,特别是为管道结构的安全监测提供了技术保障。介绍了分布式光纤传感、光纤光栅传感、阵列复用传感、以及光纤智能传感的基本原理及关键技术,对其性能和特点进行了对比分析。在此基础上,阐述了各种光纤传感技术在管道监测中的具体应用,包括管道结构监测、管道泄漏监测以及管道腐蚀监测。通过对传感技术的不同应用进行比较分析,总结了各传感技术应用的特点和进一步研究发展的方向,指出光纤传感技术在管道监测方面具有的巨大优势和广泛的应用前景。     

Fiber optic sensors for noncontact process monitoring in a microwave environment

This article reports on the design and development of two fiber optic sensing systems that facilitate the cure monitoring of an epoxy/amine thermoset in a microwave oven. First, the design, construction, and evaluation of a fiber optic probe were necessary so that noncontact diffuse reflectance spectra could be obtained during the curing of the resin in a microwave oven. Second, a low‐cost, disposable fiber optic temperature sensor had to be developed for use in the microwave oven because the use of conventional metal‐based thermocouples was not possible. The deployment of the two sensor systems was demonstrated successfully. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3868–3873, 2003     

RFI工艺中有关树脂流动监测的研究

渗透率测量是树脂膜熔渗（阴）技术在复合材料设计和优化中最关键的条件。基于光导纤维视觉技术，通过纤维视觉传感器测量渗透率，能够在光强度下降的情况下探测出树脂的流动情况，这将易于我们在实际生产中在第一时间内准确的监测树脂的流动。     

循环流化床稀相流动局部空隙率的测量

本文采用激光相让多普勒颗粒分析仪（PDPA）测量流化床气固两相流局部瞬时流动结构．通过测量瞬时颗粒直径、速度及颗粒通过测量体的渡越时间，分析导出了一种计算局部瞬时空隙率的方法实验证明即使在很稀的稀相流动中仍存在着不均匀的流动结构．在同一流动条件下，还用光纤探针测量了瞬时空隙率．结果表明PDPA测量方法能够测量出光纤探针无法测量到的稀相流动中微观瞬时流动结构的变化．     

A fiber optic thermoset cure monitoring sensor

Curing determines the chemical and physical properties of a reacting resin. Among these, the optical properties strongly correlate with the structural features of the developing polymeric network. By monitoring changes of the refractive index, it is possible to analyze the polymerization of thermoset resin. In this work, a fiber optic sensor system has been designed and developed (based on the optical time domain reflectometry principle) to measure the reflection coefficient at the interface between the fiber optic and the resin during a curing process. Correlation between the sensor output and conversion has been proposed, following the Lorentz‐Lorenz law. Isothermal data from the sensor have been compared with calorimetric analysis of an epoxy‐based resin.     

挤出过程聚合物停留时间分布的在线测量新系统

提出一种新型的物料停留时间分布(RTD,Residence Time Distribution)在线测量装置。基于光纤传感器对熔融聚合物内颜色浓度变化的响应,在稳定挤出后脉冲加入色母粒示踪剂,对光纤传感器的输出实时采集,得到RTD曲线。还对光纤传感器输出与示踪剂浓度的线性关系、RTD测量系统的重现性进行了验证。     

Carbon nanotubes grown on glass fiber as a strain sensor for real time structural health monitoring

In order to more effectively monitor the health of composite structures, a fuzzy fiber sensor has been developed. The fuzzy fiber is a bundle of glass fibers with carbon nanotubes or nanofibers (CNTs or CNFs) grown on the surface. The nanotube coating makes the fiber bundle conductive while the small conductive path increases sensitivity. The fuzzy fiber sensor can replace conventional metal foil strain gauges in composite applications. The electrical response of the sensor is monitored in real time to measure strain, vibration, cracking and delamination. Continuous monitoring provides instant notification of any problems. Implementation of this sensor network in a composite can increase service life, decrease maintenance costs and greatly reduce inspection downtime.     

Health monitoring of structural composites with embedded carbon nanotube coated glass fiber sensors

Structural health monitoring (SHM) seeks to provide ongoing monitoring of a structure’s integrity. Current SHM approaches include embedding some type of sensor within the composite or applying a sensor to the outside surface of the structure. These sensors react to strain or other changes in order to detect damage. In this study, a novel, multi-modal, nanomaterial based sensor technology that can provide wide area detection of damage was used. The efforts presented here serve as a feasibility study into the incorporation of carbon nanomaterials into structural composites as sensors. The carbon nanotube (CNT) covered fiber (fuzzy fiber) sensors exhibit similar sensitivity to conventional strain gages and are more easily integrated into composite structures as the sensor itself is a composite. The fuzzy fiber strain gages can be used to sense strain within composite structures and can be readily integrated into the structural laminate to provide sensing over large sections and in previously inaccessible locations. The unique properties of the fuzzy fiber lends itself to application in a wide range of sensing tasks within a structural composite including strain, temperature, degradation, etc. The fuzzy fiber may be tailored so that the same basic sensor can be used for a multitude of sensing applications.     

Optische Sensoren für die Bioprozeß-Kontrolle

Optical sensors for bioprocess control. Bioprocess techniques are an important field in biotechnology. To run processes with high yields of products, to ensure product quality and for process optimization it is essential to acquire relevant process and control parameters quickly with high reliability. Therefore, various types of sensors are used; recently, beside chemosensors, new emphasis has been placed on biosensors for bioprocess control. At the same time optical transducers are gaining in significance. One reason for the increasing interest in optical sensors is the ready availability of fiber optic technologies. The combination of sensor technologies with fiber optics offers many possibilities due to miniaturisation and remote control and therefore meets the special requirements of bioprocess techniques. This review introduces various classes of optical chemo- and biosensors for bioprocess control.     

A novel optical aerosol detector utilizing an optic fiber with conductive polymer coating

The detection of atmospheric aerosol particles is becoming an important issue in many fields such as environmental science, occupational medicine, semiconductor industry and material science. In the present paper, we utilized the conductive polymer, polypyrrole (PPy), as a sensitive membrane for detecting aerosol particles optically. A polymer optical fiber reflectance probe is constructed by depositing the PPy nanofilm at the end face of the fiber. The sensor principle relies on the change in the refractive index of the PPy nanofilm upon its interaction with aerosol nanoparticles and on the electrostatic induction between aerosol particles and the PPy nanofilm, which leads to a change in the reflected intensity. For preliminary evaluation of optical aerosol detector, three types of aerosol particles, NaCl, black carbon (BC) and polystyrene latex (PSL), are selected. The fabricated fiber optic reflectance probe using the PPy nanofilm shows distinct variations in the reflected light intensity depending on the type of aerosol particle and its properties. The proposed sensing approach may promote the use of conductive polymers in optical techniques for the detection of atmospheric aerosols.     

大口径结构壁管环刚度试验机测力系统的应用研究

分析了大口径结构壁管环刚度测定中,试样结构壁的不均匀性及侧偏放置对测量结果的影响,提出了三点测力传感器结构的测力系统方案,并以此为基础给出了该方案的硬件结构和软件设计,进而同单点测力传感器测力系统进行了试验对比。结果表明:三点测力传感器结构测力系统,可以有效地消除因试样结构壁不均匀及试样侧偏放置而造成的环刚度测定误差。