基于啁啾布拉格光纤光栅(CFBG)的混凝土磨蚀监测方法
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摘要
提出了一种基于啁啾布拉格光纤光栅(CFBG)的混凝土磨蚀监测方法,其基本工作原理在于光纤光栅长度会随着混凝土磨蚀的发生而同步变短,从而引起光栅反射光谱带宽变窄,继而利用光纤光栅的相关理论计算得到混凝土磨蚀深度。同时,还描述了一种计算混凝土磨蚀深度的简单算法,并通过对比试验验证传感器测试的精度。试验结果表明:对于单点的磨蚀深度测量结果,该方法的测量精度可达到亚毫米级别,可应用于水工建筑物表面磨蚀状态的实时监测。
A chirped fiber Bragg grating( FBG)-based concrete abrasion monitoring method is put forward herein,of which the working principle is that the length of the fiber grating can be shortened simultaneously along with the occurrence of concrete abrasion,and then lead the bandwidth of the reflected light spectrum to be narrowed accordingly,thus obtain the depth of the concrete abrasion from the calculation in accordance with the relevant theory of fiber Bragg grating. Simultaneously,a simple algorithm for calculating the depth of the concrete abrasion is described and the testing accuracy of the sensor is verified through the comparative test concerned as well. The test result shows that the measured accuracy of this method can reach to the level of submillimeter for the result of the abrasion measuring on a single point,thus it can be applied to the real-time monitoring of the surface abrasion status of hydraulic structure.
A chirped fiber Bragg grating( FBG)-based concrete abrasion monitoring method is put forward herein,of which the working principle is that the length of the fiber grating can be shortened simultaneously along with the occurrence of concrete abrasion,and then lead the bandwidth of the reflected light spectrum to be narrowed accordingly,thus obtain the depth of the concrete abrasion from the calculation in accordance with the relevant theory of fiber Bragg grating. Simultaneously,a simple algorithm for calculating the depth of the concrete abrasion is described and the testing accuracy of the sensor is verified through the comparative test concerned as well. The test result shows that the measured accuracy of this method can reach to the level of submillimeter for the result of the abrasion measuring on a single point,thus it can be applied to the real-time monitoring of the surface abrasion status of hydraulic structure.
引文
[1]杨春光.水工混凝土抗冲磨机理及特性研究[D].杨凌:西北农林科技大学,2006.
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[23]SNYDER A W.Coupled mode theory for optical fibers[J].Journal of the optical society of America,1972,62(11):1267-1277.
[24]YARIV A.Coupled-mode theory for grided-wave optics[J].IEEE Journal of quantam electronics,1973,9(9):919-933.
[25]MATSUHARA M,HILL K O,WATANABE A.Optical-waveguide fliters:Synthesis[J].Journal of the optical society of America,1975,65(7):804-809.
[26]李川,张以谟,赵永贵,等.光纤光栅:原理、技术与传感应用[M].北京:科学出版社,2005.
[27]OTHONOS A,KALLI K.Fiber bragg gratings,fundamentals and application in telecommunications and senging[M].London:Artech House,1999.
[2]郭捷山.向家坝泄洪诱发低频声波引起房屋卷帘门振动研究[D].天津:天津大学,2014.
[3]李瓒,陈新华,郑建波,等.混凝土拱坝设计[M].北京:中国电力出版社,2000.
[4]U.S.Army engineer waterways experiment station.Hydraulic Design criteria[R].Vicksburg,Mississippi,1959.
[5]张建民,杨永全,戴光清.高拱坝挑跌流泄洪消能水垫塘底板稳定性研究[J].四川大学学报(工程科学版),2000,32(2):17-21.
[6]肖兴斌,袁玲玲.高拱坝泄洪消能防冲技术发展与应用述评[J].水电站设计,2003,19(1):59-63.
[7]尹延国,胡献国,崔德密,等.含沙高速水流状态下水工混凝土的磨损问题探讨[J].混凝土与水泥制品,1999(3):14-16.
[8]彭文祥.官地水垫塘底板泄洪振动响应特性研究[D].天津:天津大学,2012.
[9]郭捷山.向家坝泄洪诱发低频声波引起房屋卷帘门振动研究[D].天津:天津大学,2015.
[10]KRYZANOWSKI A,MIKOS M,SUSTERSIC J,et al.Abrasion resistance of concrete in hydraulic structures[J].ACI materials journal,2009,106(4):349-356.
[11]刘强.超高强高耐磨混凝土材料研究[D].长沙:湖南大学,2009.
[12]LOPEZ-HIGUERA J M,RODRIGUEZ-COBO L,INCERA A Q,et al.Fiber optic sensors in structural health monitoring[J].Journal of lightwave technology,2011,29(4):587-608.
[13]欧进萍,周智,武湛君,等.黑龙江呼兰河大桥的光纤光栅智能监测技术[J].土木工程学报,2004,37(1):45-49.
[14]王元丰,韩冰,周耀,等.地铁车站结构健康监测研究[J].都市快轨交通,2008,21(5):34-38.
[15]RUSSELL P S J.Bloch wave analysis of dispersion and pulse propagation in pure distributedfeedback structures[J].Journal of modern optics,1991(38):1599-1619.
[16]PEARL E,CAPMANY J.Generalized Bloch wave analysis for fiber and waveguide gratings[J].Journal of lightwave technology,1997(15):1295-1302.
[17]WELLER-BROPHY L A,HALL D G.Analysis of waveguide gratings:application of Rouard's method[J].Journal of the optical society of America A,1985,2(6):863-871.
[18]WELLER-BROPHY L A,HALL D G.Analysis of waveguide gratings:acomparision of Rouard's methodand coupled mode theory[J].Journal of the optical society of America A,1987,4(1):60-65.
[19]YEE K.Numerical solution of initial boundary value problems Involving Maxwell's Equations in Isotropic Media[J].IEEE transactions on antennas and propagation,1966(14):302-307.
[20]HUANG W P,CHU S T,GOSS A,et al.CHAUDHURI,A scalar finite-difference time-domain approach to guided-wave optics[J].IEEE Photonics Technology Letters,1991,3(6):524-526.
[21]YAMACHI J,NIBE M,NAKANO H.Scalar FD-TD method for circularly symmetric waveguides[J].Optical and quantum electronics,1997,29(4):451-460.
[22]ERDOGAN T.Fiber grating spectra[J].Journal of lightwave technology,1997,15(8):1277-1294.
[23]SNYDER A W.Coupled mode theory for optical fibers[J].Journal of the optical society of America,1972,62(11):1267-1277.
[24]YARIV A.Coupled-mode theory for grided-wave optics[J].IEEE Journal of quantam electronics,1973,9(9):919-933.
[25]MATSUHARA M,HILL K O,WATANABE A.Optical-waveguide fliters:Synthesis[J].Journal of the optical society of America,1975,65(7):804-809.
[26]李川,张以谟,赵永贵,等.光纤光栅:原理、技术与传感应用[M].北京:科学出版社,2005.
[27]OTHONOS A,KALLI K.Fiber bragg gratings,fundamentals and application in telecommunications and senging[M].London:Artech House,1999.