光纤布拉格光栅热式流量传感技术研究

光纤布拉格光栅(Fiber Bragg Grating, FBG)热式流量传感技术具有测量阈值低、灵敏度高等优点,是近年来流量测量领域的研究热点。概述了FBG热式流量传感原理,总结了当前该技术研究的重点和难点问题(主要分为传感器加热、结构设计、温度补偿和封装增敏四个方面),旨在发现问题、展望未来。从近年来的典型研究成果入手,分析了电加热、光加热两种传感器加热方式和热线式传感结构。温度补偿和封装增敏部分则作为专题来研究,其中温度补偿旨在解决传感器加热换热与环境温度交叉敏感问题。最后归纳分析了该技术在大流量时的低灵敏度特性,并讨论了提升传感器灵敏度未来可能的研究方向和相关方法。     

光纤布喇格光栅：制作,性能及应用

介绍了国外正迅猛发展的光纤布喇格光栅的制作、性能及其应用。     

Occurrence of Features of Fiber Bragg Grating Spectra Having a Wavelength Corresponding to the Phase Mask Periodicity

The use of a phase mask with 536 nm uniform pitch allowed the fabrication of a fiber Bragg grating for use at a Bragg wavelength of 785 nm. Reflection and transmission features at 1552 nm, twice the Bragg wavelength, associated with the phase mask periodicity were observed. However, when phase mask orders other than ＋1 were absent during fabrication the features at 1552 nm were not evident.     

FBG传感技术在矿山地压监测中的应用

在分析光纤Bragg光栅传感(FBG)原理的基础上,提出基于FBG的地压监测系统。在承德铜兴矿业有限责任公司建立该地压监测系统,实时监测岩体的位移和压力变化。监测结果表明,FBG传感技术可有效监测岩体位移和压力变化,可靠性和稳定性较好,具有广阔的应用前景。     

基于FBG的矿山安全监测传感器特性研究

在FBG传感原理的理论分析基础上,应用FBG传感技术对用于矿山安全监测的光纤中心波长变化特性进行了试验研究。通过采用恒温箱和压力机对安装在岩块上FBG传感器的温度和应变传感特性进行了试验,并对试验结果进行分析。试验结果表明,光纤Bragg光栅的波长随温度和轴向应变的变化呈现出良好的线性关系,且重复性较好。试验验证了光纤Bragg光栅传感技术检测矿山岩块介质温度和应变变化的有效性,为光纤Bragg光栅传感技术在矿山工程结构健康监测提供了理论依据和试验数据,对矿山安全监测具有借鉴作用和重要意义。     

应用光纤布拉格光栅监测悬臂梁的变形

提出应用光纤布拉格光栅传感器来测量悬臂梁在弯曲时的应变的新方法,将得到的实验数据和应变片检测的结果以及理论计算的结果进行比较,证明了光纤布拉格光栅传感器测量应变的精确性。     

Photoconducting Bragg Mirrors based on TiO2 Nanoparticle Multilayers

A synthetic route to building photoconducting films of TiO₂ nanoparticles that display bright structural color is presented. The color arises as a result of the periodic modulation of the refractive index, which is achieved by controlling the degree of porosity of each alternate layer through the particle size distribution of the precursor suspensions. The suspensions are cast in the shape of a film by spin‐coating, which allows tailoring of the lattice parameter of the periodic multilayer, thus tuning the Bragg peak spectral position (i.e., its color) over the entire visible region. Photoelectrochemical measurements show that the Bragg mirrors are conductive and distort the photocurrent response as a result of the interplay between photon and electron transport.     

Fabrication of ultra high aspect ratio Bragg gratings for optical filter

In this paper a novel process for fabrication of high finesse and large spectral range integrated optics filtering structure for optical communication applications is presented.The technology approach used in the fabrication make use of glass-on-silicon substrates and comprise deep submicron ultra-high aspect ratio Bragg gratings which are deeply buried into the waveguide glass materials.     

基于波分复用技术的FBG传感器线性阵列测温系统应用研究

不同的光纤光栅可具有不同的中心波长,利用光通信技术中的波分复用技术,可以实现在一根光缆中同时传输多个不同中心波长的光信号,将这些不同波长的光纤光栅传感器级联在一根光缆上,构成传感器线性阵列拓扑结构,则可以实现准分布式的多点测量.将基于波分复用技术的光纤布拉格光栅传感器线性阵列测温系统应用于大体积混凝土施工过程中的温控测量,目前在国内尚不多见.通过在三峡工程升船机塔柱安全监测项目的温控测量,为延拓光纤布拉格光栅测温系统的应用范围积累了一些有益经验,也为光纤布拉格光栅测温系统应用于大型水利工程的混凝土温控测量获取了宝贵资料.