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Reflective Ladder Topology Network Based on White light Fiber-Optic Mach-Zehnder Interferometer

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Journal of Harbin Institute of Technology(New Series) 2013年第3期20卷 63-66页

作者： Song li Ferhati Mokhtar li-bo yuan Photonics Research Center School of ScienceHarbin Engineering University

In order to improve the multiplexing capability of the optical sensors based on the lower interferential optic fiber sensing technology and the white light fiber-optic Mach-Zehnder interferometer,reflective ladder topology network ( RLT) with tailored formula was proposed. The topology network consists of 6 rungs sensing elements linked by 5 couplers. Two cases with different choices of couplers were contrasted: one is equal coupling ratio,and the other is tailored coupling ratio. Through the simulation of these two cases,the detailed multiplexing capability was analyzed,and accordingly the experiments were also carried out. The simulation results showed that,the tailored formula enhances the multiplexing capability of the structure. In the first case, the maximum number of sensors which can be multiplexed is 8,and in the other case is 12 fiber optic sensors. The experimental results have a good agreement with numerical simulation results. Thus,it is considered expedient to incorporate RLT into large-scale building,grounds,bridges,dams,tunnels,highways and perimeter security.

关键词： fiber-optic sensor white light interferometer multiplexing technique reflective ladder topology network tailored formula

Theoretical and experimental study on white light interferometric sensing network with double-ring topology

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Frontiers of Electrical and Electronic Engineering in China 2006年第2期1卷 234-238页

作者： YANG Jun yuan li-bo Department of Physics Harbin Engineering UniversityHarbin 150001China

A white-light interferometric fiber-optic sensing network based on the double-ring topology is demonstrated,which can be applied to the measurements of quasi-distributed strain and temperature in a smart *** order to increase the multiplexing capacity,decrease the measurement cost of each sensor,and improve the ability of reliability of the sensor network,a double-port interrogating technology was *** double-ring fiber optical sensing network based on the space division multiplexing(SDM)is further *** low coherent multiplexing principle in the double-ring network structure is *** on the optical path matching condition of SDM,the intensity characteristic of the interference signal in the sensor is *** characteristics of the double-ring sensing network connecting 9 sensors and its property of robust resisting destruction are verified by experiments,and the results are analyzed and discussed.

关键词： Fiber optics Multiplexing Double-ring topology structure Sensing network

Co-7Al-7V新型钴基高温合金热变形微观组织演变

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陕西科技大学学报 2025年第1期43卷 136-141页

作者：梁泽腾何宁韩正刘锦荣陆星宇李圆博李誉之陕西科技大学机电工程学院陕西西安710021

对新型钴基高温合金Co-Al-V合金进行高温热压缩变形实验,实验变形温度为800℃~1050℃,应变速率为0.001~1 s^(-1).实验结果表明在低温低应变速率(800℃,0.001 s^(-1))、较低温较高应变速率(950℃,0.1 s^(-1))和高温高应变速率(1050℃,1 s... 详细信息

对新型钴基高温合金Co-Al-V合金进行高温热压缩变形实验,实验变形温度为800℃~1050℃,应变速率为0.001~1 s^(-1).实验结果表明在低温低应变速率(800℃,0.001 s^(-1))、较低温较高应变速率(950℃,0.1 s^(-1))和高温高应变速率(1050℃,1 s^(-1))时,合金发生动态再结晶后出现孪晶,流变应力曲线也表现出达到峰值后先下降再上升的趋势,在变形温度为800℃和950℃时,高应变速率下更容易出现孪晶,随着应变速率降低,动态再结晶程度逐渐变高,在变形温度为1050℃时,低应变速率下容易出现孪晶,随着应变速率的降低,动态再结晶程度逐渐降低.随着变形温度的升高,动态再结晶程度变高,再结晶晶粒尺寸逐渐变大.通过对EBSD测试结果分析,高温低应变速率(1050℃,0.001 s^(-1))条件下的再结晶晶粒尺寸相较于高温高应变速率(1050℃,1 s^(-1))条件下的更大,高温下的孪晶界以Σ3边界为主,并且高温下应变速率越低,Σ3边界分数越高.为优化新型钴基高温合金的加工工艺提供理论依据.

关键词：新型钴基高温合金流变应力再结晶孪晶

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Recent developments in novel silica-based optical fibers

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Frontiers of Information Technology & Electronic Engineering 2019年第4期20卷 481-489页

作者： Ting-yun WANG Fu-fei PANG Su-juan HUANG Jian-xiang WEN Huan-huan liU li-bo yuan Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai Institute for Advanced Communication and Data ScienceShanghai University Photonics Research Center Guilin University of Electronic Technology

We have summarized our recent work in the area of novel silica-based optical fibers, which can be classified into two types: silica optical fiber doped with special elements including Bi, Al, and Ce, and micro-structured multi-core fibers. For element-doped optical fiber, the Bi/Al co-doped silica fibers could exhibit a fluorescence spectrum covering the wavelength range between 1000 and 1400 nm with a full width at half maximum(FWHM) of about 150 nm, which enables its use in fiber amplifiers and laser systems. The Ce-doped fiber's center wavelengths of excitation and emission are about 340 and 430 nm, respectively. The sapphire-derived fiber(SDF) with high alumina dopant concentration in the core can form mullite through heating and cooling with arc-discharge treatment. This SDF can be further developed for an intrinsic Fabry-Perot interferometric that can withstand 1200 ℃, which allows it to be used in high-temperature sensing applications. Owing to the strong evanescent field, microstructured multi-core fiber can be used in a wide range of applications in biological fiber optic sensing, chemical measurement, and interference-related devices. Coaxial-core optical fiber is another novel kind of silica-based optical fiber that has two coaxial waveguide cores and can be used for optical trapping and micro-particle manipulation by generating a highly focused conical optical field. The recent developments of these novel fibers are discussed.

关键词： Optical fiber Fiber optic device Silica-based special fiber

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二维复式格子声子晶体带隙结构特性

物理学报 2005年第10期54卷 4511-4516页

作者：赵芳苑立波哈尔滨工程大学理学院物理系哈尔滨150001

借助于平面波展开法分析了二维复式格子声子晶体能带结构,计算了铝合金柱体按周期性结构排列在空气中形成的二维固/气复合体系的声子晶体,给出了复式蜂窝格子和复式Kagome格子的能带结构,进而对比分析了复式格子和简单格子的能带结构特... 详细信息

借助于平面波展开法分析了二维复式格子声子晶体能带结构,计算了铝合金柱体按周期性结构排列在空气中形成的二维固/气复合体系的声子晶体,给出了复式蜂窝格子和复式Kagome格子的能带结构,进而对比分析了复式格子和简单格子的能带结构特性.结果表明,与简单格子相比,复式格子的带隙出现在频率相对较低的位置;在f=0·091—0·6046范围内,将声子晶体排列为复式格子要优于简单格子,可以得到更宽带隙.此外,引入了带隙分布图,讨论了填充系数f对带隙数目、带隙宽度以及带隙上下边界频率的影响.

关键词：声子晶体复式格子带隙平面波算法结构特性宽带隙格子复式二维能带结构

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二维声子晶体同质位错结缺陷态特性

物理学报 2006年第2期55卷 517-520页

作者：赵芳苑立波哈尔滨工程大学理学院物理系哈尔滨150001

利用平面波展开法结合超原胞的方法研究了二维声子晶体同质位错结的缺陷态.分别研究了横向位错和纵向位错两种情况,研究结果表明:横向位错效应与线缺陷相似,它可以使处于禁带频率范围内的声波沿位错通道进行传播,形成声波导;纵向位错效... 详细信息

利用平面波展开法结合超原胞的方法研究了二维声子晶体同质位错结的缺陷态.分别研究了横向位错和纵向位错两种情况,研究结果表明:横向位错效应与线缺陷相似,它可以使处于禁带频率范围内的声波沿位错通道进行传播,形成声波导;纵向位错效应则类似于点缺陷,位错线两边三个最接近的散射子形成腔,因而能够产生局域模.另外,横向位错距离和纵向位错距离的大小将影响缺陷带的位置和数量,因此,可以通过调节横向位错距离或纵向位错距离来人为的控制同质位错结中的缺陷带.

关键词：声子晶体同质位错结缺陷态

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具有嵌入式环形拓扑结构的光纤传感器网络

中国激光 2005年第10期32卷 1391-1396页

作者：杨军苑立波哈尔滨工程大学理学院黑龙江哈尔滨150001

提出了一种基于光学低相干反射(OLCR)技术的嵌入式双环形光纤传感网络。给出了光纤传感网络结构、空分复用(SDM)原理,分析了网络中传感器的信号特性,对携带10个传感器的传感网络进行了实验研究。理论和实验研究表明,通过改变环形网络中... 详细信息

提出了一种基于光学低相干反射(OLCR)技术的嵌入式双环形光纤传感网络。给出了光纤传感网络结构、空分复用(SDM)原理,分析了网络中传感器的信号特性,对携带10个传感器的传感网络进行了实验研究。理论和实验研究表明,通过改变环形网络中传感器的安放位置与布设数量,对网络的传感特性进行优化,可以提高传感系统的复用能力。此结构可嵌入智能结构中,用于准分布应变或温度的测量。

关键词：导波光学光学低相干反射计空分复用嵌入式双环结构传感网络

Application of robust estimation to pit deformation monitoring

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中国有色金属学会会刊：英文版 2005年第S1期15卷 62-64页

作者： li Ming-feng, yuan bo (Nanjing University of Technology, Nanjing 210009, China)

To guarantee the safety and the quality of the deep pit construction of a high building, it is necessary to monitor the deformation of the supporting structure of the pit. At present, there are mainly two methods to monitor the geometric deformation of the supporting structure of the pit. One is to monitor the displacements of the tops of the piles; the other is to monitor the deep displacements of the piles. Based on the analysis of the characteristics of both the top monitoring data and the deep monitoring data, a united data processing method was put forward. A model of conicoid fitting model was chosen to describe the deformation surface of the pit, and then the robust estimation was adopted to avoid the influence of the gross errors existing in the observations. It was proved effective and accurate to analyze the deformation of the monitoring surface with this method. The steps of the method were concluded in detail.

关键词： pit displacement monitoring conicoid fitting model gross error robust estimation.

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六角蜂窝结构光子晶体异质结带隙特性研究

物理学报 2006年第3期55卷 1244-1247页

作者：关春颖苑立波哈尔滨工程大学理学院哈尔滨150001

利用蜂窝结构光子晶体具有两个范围较大绝对带隙的特性,设计新型六角蜂窝结构光子晶体异质结,采用平面波展开和超晶胞相结合的方法来研究异质结的能带结构特性.给出异质结的结构和相应的能带图,分析异质结界面传导模,研究两侧结构作横... 详细信息

利用蜂窝结构光子晶体具有两个范围较大绝对带隙的特性,设计新型六角蜂窝结构光子晶体异质结,采用平面波展开和超晶胞相结合的方法来研究异质结的能带结构特性.给出异质结的结构和相应的能带图,分析异质结界面传导模,研究两侧结构作横向拉开和侧向滑移时对传导模的影响,讨论这些结构的实际可行性.计算结果表明,没有任何晶格移动,此种结构异质结在绝对带隙中就有导模存在,两边晶格横向拉开对导模影响较大,而侧向滑移的影响则较小.

关键词：光子晶体异质结光子带隙超晶胞