光纤传感器的发展和研究动向

叙述了国内外光纤传感器的研究情况、市场动态以及几种光纤传感器的原理,特别叙述了国内光纤传感器的发展和有关单位的研制情况以及今后的研究动向。     

纳米锥SiGe-SOI光波导与光纤的耦合分析

Based on a submicrometer-sized SiGe-SOI waveguide, the coupling loss mechanism is analyzed between the submicrometer-sized SiGe-SOI waveguide and the fiber. The main sources of coupling loss are analyzed, and the mismatch loss of the mode field is the mainly lost during connection between the submicrometer-sized waveguide and the fiber. In order to reduce the mismatch loss of the mode field, the structure ofa nanotaper SiGeSOI waveguide with a nanometer-sized tip is adopted. By reducing the waveguide dimensions to increase the mode field size, coupling loss could be reduced between the waveguide and the fiber. Different mode field dimensions ofnanotaper SiGe-SOI waveguides and fiber are quantitatively analyzed, and the quantitative relationship between nanotaper SiGe-SOI waveguide dimensions and mode field dimensions are obtained. Finally, nanotaper SiGe-SOI waveguides are made, and the test and analysis have been done. The final experimental results accord well with the theoretical analysis. When the waveguide width is 0.5 μm, the minimum coupling loss of the SiGe-SOI waveguide is 0.56 dB/facet, and also the correctness of the design method and theoretical analysis are verified.     

机器人光纤接近觉传感技术的发展新动向

介绍在智能机器人研究中占有重要地位的光纤接近觉传感技术的国内外动态，指出其发展仍以强度调制光纤传感机理为主，其研究重点为传感器性能中传感功能集成（位姿型）、测量范围和动态性能的提高、鲁棒性能的加强和传感信息融合等问题     

The use of a figure-of-eight coil for fibre optic respiratory plethysmography: Geometrical analysis and experimental characterisation

An optical fibre sensor based on the macro-bending loss effect has been redeveloped for thoracic and abdominal circumference measurements in non-invasive plethysmographic respiratory monitoring. A new geometrical analysis of the figure-of-eight transducer is presented, along with an optical analysis, and experimental results are presented which are in good agreement with these analyses. A comparison is made with earlier implementations of macrobending loss effect based transducers for respiratory measurement, and the newer sensor compares favourably, indicating a higher resolution and a simpler mechanical construction.     

Optical fibre magnetic field sensors

A class of high sensitivity fibre-optic magnetic sensors has been developed and successfully tested in the laboratory for the first time. The magnetic sensors employ magnetostrictive jacketing materials in conjunction with conventional single-mode optical fibres. An all-fibre Mach-Zender interferometer was used to detect the magnetically induced changes in optical path length which arise because of strains transferred to the fibre from the magnetostrictive jacket.     

光纤浊度仪

光纤浊度仪是测量水中杂质含量及其变化的一种仪器,该仪器具有测速快和准确性高的特点。本文介绍了仪器的原理结构及主要参数。     

朗讯科技的光纤技术与光联网产品

通信业务量的爆炸式增长,要求不断提高网络的传输速度和交换容量。朗讯科技适时推出全波和真波光纤,Wavestar、OptiStar等DWDM系统,WaveStar LambdaRouter、WaveStar BandWidth Manager等光联网络设备,为运营商实施高速宽带铺平道路。本文详细描述了朗讯科技的新一代光纤技术及其光联网产品。     

对光纤位移传感器耦合效率的修正

采用积分的方法，算出了两光纤位移传感器的耦合效率，导出了光纤位移传感器耦合效率的解析表达工，并与常规理论计算的结果进行了比较。     

Optical fibre microbending sensors by micromachining techniques

A practical tactile sensor using micromachined techniques has been implemented and evaluated. Optical fibres laid on the pedestals of micromachined silicon showed outstanding improvement in sensitivity, mechanical decoupling between fibres and excellent repeatability. The upper cover made from plastic and Cu-Be foils, not only provides a protective membrane to the sensor but also acts as the force concentrator, allowing better force point resolution.<>     

强度调制型荧光光纤温度传感器原理性实验系统

强度调制型荧光光纤温度传感器具有其它光纤温度传感器所不具有的优点。本文设计并建立了该传感器的原理性实验系统，证实了其测温的可行性，并为进一步实用化创造了条件。     

大气光学湍流对光电探测器性能的影响

采用激光闪烁仪和超声风速计对沿海某地冬、夏季的大气光学湍流和风速进行了较长时期的测量,得到了其平均的统计特征。并据此分析了大气折射率结构常数的累积出现概率为50%和90%时大气湍流对光电探测器性能的影响。结果表明:(1)对于水平传输,大气湍流对短波和中波红外成像系统的影响随着传输距离或湍流强度的增加而超过系统的衍射受限占主要地位,对长波红外告警系统的影响可以忽略。(2)对于斜程传输,大气湍流的影响随天顶角的增加而增加,在天顶角小于60°的情况下,大气湍流对系统性能影响的变化不超过45%;而在天顶角超过60°之后,大气湍流的影响迅速增加,其影响最大可以超过3倍。     

机电部三十四所建成了光纤宽带综合业务数字网

本文介绍了三十四所从西德ANT公司引进的光纤宽带综合业务数字网(B-ISDN)。描述了机电部三十四所在“七五”期间有关B-ISDN的研究情况。对今后B-ISDN的发展作了初探。     

光通信无源器件的现状和展望

文章介绍了近年来光纤活动连接器,光分、合波器,光开关等光通信无源器件的现状及发展趋势,尤其介绍了光纤用户网系统光纤无源器件的开发情况。     

国外工业用光纤传感器市场状况

本文引用大量图表和数据对国外工业用光纤传感器市场状况进行了分析,并阐述了光纤传感器的研究水平和商业行情,展现了光纤传感器的光明前景。     

干涉型光纤传感器直流相位跟踪检测系统的改进

对干涉型光纤传感器直流相位跟踪检测系统进行了分析和改进，通过在检测系统中加入简单的电路模块，使系统的幅频响应特性得到改善。建立了Michelson光纤干涉型传感系统，实验结果与理论分析相吻合。     

强度调制光纤多传感补偿网络所能补偿传感器的极限数目

本论文从对传感补偿网络的基础理论的探索性研究出发，首次提出强度调制光纤多传感补偿网络所能补偿传感器数目的理论极限公式，对多传感补偿网络的设计和应用有着重要的指导意义。     

光源与纤端光场

本讲简述了光纤传感系统中的光源，建立了光纤端光场分布函数，讨论了光源及其与光纤耦合条件对纤端光场分布的影响，最后，介绍了纤端光场的测试方法。     

MPNIM结构光致变电容效应

本文报告了作者之一首先发现的MPNIM(金属-P型半导体-N型半月比-绝缘体-金属)结构的光致变电容效应。基于该效应已研制出新器件:半导体双向光控变容器.新器件的电容值与入射光强的关系,光谱响应特性,频率特性,C-V特性,温度特性已被研究.     

Optical resonances in dielectric microspheres for transverse magnetic wave

Optical resonances for Transverse Magnetic (TM) wave based on Whispering Gallery Modes (WGM) have been presented with comprehensive mathematical formulations. The present study is characterized both theoretically and experimentally by considering the fact that the size parameter of the dielectric microspheres is very large at optical wavelengths. An asymptotic expression has been developed based on electromagnetic theory for large size parameter. The developed expressions for optical resonance condition of TM wave are very simple and can accurately characterize resonances in dielectric microspheres. The theoretical development is mathematically robust and significantly less complicated than existing approaches based on quantum physics presented in the literatures. The theoretical result of size parameter for consecutive morphology dependent resonance (MDR) peaks is validated by experimental data. The comparisons are shown to be very accurate for large size parameters.     

多种气体一体化测量的光纤传感技术研究

基于气体在吸收峰波长下对光的吸收随浓度变化的原理,研制一种光纤式气体监测仪,根据被测气体的吸收峰对应的波长选择分布反馈式半导体激光器作为光源,采用不同频率的光源驱动电路实现对多种气体浓度的同时检测。对甲烷和乙炔气体浓度的检测实验表明,该系统具有一定的检测灵敏度和精度。