薄壁圆环分布式光纤测力传感器的性能
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摘要
提出了一种基于分布式光纤应变感测的测力方法,开展了基于布拉格光纤光栅技术(FBG)和布里渊散射光时域分析技术(BOTDA)的薄壁圆环加载实验,详细阐述了分布式光纤传感器的原理、数据拟合及误差分析等问题。为了更进一步验证所提方法的可行性,实验中对FBG和BOTDA所获结果进行了对比分析。实验结果表明,通过BOTDA数据计算的作用力更加接近于实际测量值,证明了分布式光纤监测技术满足土工实验数据采集的精确性要求。
This study develops a force-measurement method based on distributed optical fiber strain sensing.A thinwalled ring loading test with the fiber Bragg grating(FBG)and Brillouin optical time domain analysis(BOTDA)techniques is performed.The principles of fiber optic sensing,data fitting,and error analysis are also introduced in detail.The results obtained by FBG and BOTDA are compared and analyzed in the experiment to further verify the feasibility of proposed method.The experimental results show that the load value calculated by the BOTDA data is closer to the actual one.Furthermore,the distributed fiber optical monitoring technology has been proven to meet the accuracy requirements of data acquisition in geotechnical tests.
This study develops a force-measurement method based on distributed optical fiber strain sensing.A thinwalled ring loading test with the fiber Bragg grating(FBG)and Brillouin optical time domain analysis(BOTDA)techniques is performed.The principles of fiber optic sensing,data fitting,and error analysis are also introduced in detail.The results obtained by FBG and BOTDA are compared and analyzed in the experiment to further verify the feasibility of proposed method.The experimental results show that the load value calculated by the BOTDA data is closer to the actual one.Furthermore,the distributed fiber optical monitoring technology has been proven to meet the accuracy requirements of data acquisition in geotechnical tests.
引文
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[13] Lee J T,Tien K C,YEN T E H O,et al.A fiber optic sensored triaxial testing device[J].ASTM Geotechnical Testing Journal,2011,34(2):103-111.
[14] Ding Y,Wang P,He N,et al.New method to measure deformation of SMW piles based on BOTDA[J].Chinese Journal of Geotechnical Engineering,2011,33(5):719-724.丁勇,王平,何宁,等.基于BOTDA光纤传感技术的SMW工法桩分布式测量研究[J].岩土工程学报,2011,33(5):719-724.
[15] Zhu H H,Shi B,Yan J F,et al.Physical model testing of slope stability based on distributed fiberoptic strain sensing technology[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(4):821-828.朱鸿鹄,施斌,严珺凡,等.基于分布式光纤应变感测的边坡模型试验研究[J].岩石力学与工程学报,2013,32(4):821-828.
[16] Timoshenko S.XCI.On the distribution of stresses in a circular ring compressed by two forces acting along a diameter[J].The London,Edinburgh,and Dublin Philosophical Magazine and Journal of Science,1922,44(263):1014-1019.
[17] Kogure T, Okuda Y. Monitoring the vertical distribution of rainfall-induced strain changes in a landslide measured by distributed fiber optic sensing with Rayleigh backscattering[J]. Geophysical Research Letters,2018,45(9):4033-4040.
[18] Li B,Zhang D,Chen X X,et al.Testing method on performance of deformation coupling between distributed sensing fiber and soil[J].Geological Journal of China Universities,2017,23(4):633-639.李博,张丹,陈晓雪,等.分布式传感光纤与土体变形耦合性能测试方法研究[J].高校地质学报,2017,23(4):633-639.
[2] Horiguchi T, Tateda M. BOTDA-nondestructive measurement of single-mode optical fiber attenuation characteristics using Brillouin interaction:theory[J].Journal of Lightwave Technology,1989,7(8):1170-1176.
[3] Zhou D W, Wang B Z,Ba D X,et al.Fast distributed Brillouin optical fiber sensing for dynamic strain measurement[J].Acta Optica Sinica,2018,38(3):0328005.周登望,王本章,巴德欣,等.用于动态应变测量的快速分布式布里渊光纤传感[J].光学学报,2018,38(3):0328005.
[4] Ding X D,Zhang Y M,Song Y M,et al.Response characteristics of pure-quartz-core fiber Bragg grating under high temperature strain[J].Chinese Journal of Lasers,2017,44(11):1106003.丁旭东,张钰民,宋言明,等.纯石英芯光纤光栅高温应变响应特性[J].中国激光,2017,44(11):1106003.
[5] Zhang K Y,Zhao H,Zhang W C,et al.Fiber Bragg grating electrostatic voltage sensor based on uniform strain beam[J].Acta Optica Sinica,2015,35(3):0306003.张开玉,赵洪,张伟超,等.基于等应变梁的光纤光栅静电电压传感器[J].光学学报,2015,35(3):0306003.
[6] Wang Y H,Liu J W,Zhang M Y,et al.Test on axial force of double-walled mode pipe pile based on fiber Bragg grating[J].Laser&Optoelectronics Progress,2018,55(11):110605.王永洪,刘俊伟,张明义,等.基于光纤布拉格光栅的双壁模型管桩轴力测试[J].激光与光电子学进展,2018,55(11):110605.
[7] Zhu Y Q,Zhu H H,Sun Y J,et al. Model experiment study of pipe pile driving into soil using FBG-BOTDA sensing monitoring technology[J].Rock and Soil Mechanics,2014,35(S2):695-702.朱友群,朱鸿鹄,孙义杰,等.FBG-BOTDA联合感测管桩击入土层模型试验研究[J].岩土力学,2014,35(S2):695-702.
[8] Wang F, Huang H W, Zhang D M,et al.Deformation sensing method of shield tunnel based on optical fiber sensing technology of BOTDA[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(9):1901-1908.王飞,黄宏伟,张冬梅,等.基于BOTDA光纤传感技术的盾构隧道变形感知方法[J].岩石力学与工程学报,2013,32(9):1901-1908.
[9] Mohamad H, Soga K, Bennett P J,et al.Monitoring twin tunnel interaction using distributed optical fiber strain measurements[J].Journal of Geotechnical and Geoenvironmental Engineering,2012,138(8):957-967.
[10] Xu D S,Borana L,Yin J H.Measurement of small strain behavior of a local soil by fiber Bragg gratingbased local displacement transducers[J]. Acta Geotechnica,2014,9(6):935-943.
[11] Cao D F,Shi B,Yan J F,et al.Distributed method for measuring moisture content of soils based on CDTS[J]. ChineseJournalofGeotechnical Engineering,2014,36(5):910-915.曹鼎峰,施斌,严珺凡,等.基于C-DTS的土壤含水率分布式测定方法研究[J].岩土工程学报,2014,36(5):910-915.
[12] Feng W Q,Liu Z Y,Tam H Y,et al.The pore water pressure sensor based on Sagnac interferometer with polarization-maintaining photonic crystal fiber for the geotechnical engineering[J].Measurement,2016,90:208-214.
[13] Lee J T,Tien K C,YEN T E H O,et al.A fiber optic sensored triaxial testing device[J].ASTM Geotechnical Testing Journal,2011,34(2):103-111.
[14] Ding Y,Wang P,He N,et al.New method to measure deformation of SMW piles based on BOTDA[J].Chinese Journal of Geotechnical Engineering,2011,33(5):719-724.丁勇,王平,何宁,等.基于BOTDA光纤传感技术的SMW工法桩分布式测量研究[J].岩土工程学报,2011,33(5):719-724.
[15] Zhu H H,Shi B,Yan J F,et al.Physical model testing of slope stability based on distributed fiberoptic strain sensing technology[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(4):821-828.朱鸿鹄,施斌,严珺凡,等.基于分布式光纤应变感测的边坡模型试验研究[J].岩石力学与工程学报,2013,32(4):821-828.
[16] Timoshenko S.XCI.On the distribution of stresses in a circular ring compressed by two forces acting along a diameter[J].The London,Edinburgh,and Dublin Philosophical Magazine and Journal of Science,1922,44(263):1014-1019.
[17] Kogure T, Okuda Y. Monitoring the vertical distribution of rainfall-induced strain changes in a landslide measured by distributed fiber optic sensing with Rayleigh backscattering[J]. Geophysical Research Letters,2018,45(9):4033-4040.
[18] Li B,Zhang D,Chen X X,et al.Testing method on performance of deformation coupling between distributed sensing fiber and soil[J].Geological Journal of China Universities,2017,23(4):633-639.李博,张丹,陈晓雪,等.分布式传感光纤与土体变形耦合性能测试方法研究[J].高校地质学报,2017,23(4):633-639.