布里渊光时域分析(Brillouin Optical Time Domain Analysis, BOTDA) 利用了布里渊受激放大特性,在测量精度和空间分辨率等方面有独特的优势。在应用基于BOTDA的分布式光纤传感技术对结构应变进行监测时,存在布里渊频移对应变和温度交叉敏感的问题。为了消除温度对应变监测的影响,基于BOTDA原理提出了一种温度补偿方法。结果表明该方法可通过附着成一体的应变和温度传感光纤的换算得到消除温度影响后的应变,无需得到待测物温度场,布设安装和数据处理均较方便,温度信息同步性和环境适应性较佳,且成本低廉,与现有温度补偿方法相比具有显著优势。通过对比室内水浴试验和某排水泵站现场试验的结果,可知基于BOTDA的光纤分布式传感温度补偿方法是有效的。
Abstract
Brillouin optical time domain analysis (BOTDA) has unique advantages in measuring precision and spatial resolution due to stimulated amplification of Brillouin scattering. When BOTDA-based distributed fiber optic sensors are applied to strain monitoring of structures, the Brillouin frequency shift is sensitive to both strain and temperature. To eliminate the influence of temperature on strain, a temperature compensation method based on BOTDA is herein proposed. The temperature-compensated structural strain can be obtained from the strain recorded from the integrated cable including optical fibers of both temperature sensing and strain sensing without involving the temperature. The installation and data processing are convenient to be conducted with favorable information synchronizing and environmental suitability as well as low cost. The proposed method has significant advantages in comparison with existing temperature compensation methods and is validated by indoor water bath tests and field tests for a drainage pumping station during construction.
关键词
分布式光纤传感 /
布里渊光时域分析 /
温度补偿 /
结构健康监测 /
泵站
Key words
distributed fiber optic sensing /
Brillouin optical time domain analysis /
temperature compensation /
structural health monitoring /
pumping station
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 尚 盈, 王 昌. 分布式光纤传感技术综述. 应用科学学报, 2021, 39(5): 843-857.
[2] 包腾飞, 钱 飞. 混凝土裂缝分布式光纤光栅监测能力研究. 压电与声光, 2011, 33(4): 540-543.
[3] 包腾飞, 李涧鸣, 赵津磊. 基于POF-OTDR的混凝土坝裂缝定量监测及POF布设研究. 中国科学(E辑: 技术科学), 2019, 49(3): 343-350.
[4] 施 斌, 徐洪钟, 张 丹, 等. BOTDR应变监测技术应用在大型基础工程健康诊断中的可行性研究. 岩土力学与工程学报, 2004, 23(3): 493-499.
[5] 李立贡, 丁 勇, 马斌斌, 等. 基于BOTDA的深基坑桩锚支护结构变形监测. 长江科学院院报, 2016, 33(9): 48-51.
[6] 黄 祥, 甘孝清, 李 强, 等. 基于拉曼散射的分布式光纤测温系统应用研究. 长江科学院院报, 2013, 30(2): 92-96.
[7] 郭 彤, 李爱群, 宋永生, 等. 基于PPP-BOTDA的钢筋混凝土结构应变与变形监测实验研究. 中国科学(E辑: 技术科学), 2009, 39(10): 1716-1724.
[8] 聂 俊,李端有,梁 俊,等. 基于BOTDA的温度和应变测试探讨. 长江科学院院报, 2011, 28(4): 67-70.
[9] 焦浩然. 地质与岩土工程传感光缆(器)温度效应研究. 南京:南京大学, 2019.
[10] BAO X Y,YU Q R, CHEN L. Simultaneous Strain and Temperature Measurements with Polarization-maintaining Fibers and Their Error Analysis by Use of a Distributed Brillouin Loss Dystem. Optics Letters, 2004, 29(12): 13-42.
[11] WAIT P C, NEWSON T P. Landau Placzek Ratio Applied to Distributed Fibre Sensing. Optics Communications, 1996, 122(4/5/6): 141-146.
[12] ALAHBABI M N, CHO Y T, NEWSON T P. Comparison of the Methods for Discriminating Temperature and Strain in Spontaneous Brillion-based Distributed Sensors. Optics Letters, 2004, 29(1): 26-28.
[13] ALAHBABI M N, CHO Y T, NEWSON T P.Simultaneous Distributed Measurements of Temperature and Strain Using Spontaneous Raman and Brillouin Scattering∥Society of Photo-Optical Instrumentation Engineers, Proceedings of SPIE 5502, Second European Workshop on Optical Fibre Sensors, Santander, June 9, 2004: 488-491.
[14] BAO Y, CHEN G. Strain Distribution and Crack detection in Thin Unbonded Concrete Pavement Overlays with Fully Distributed Fiber Optic Sensors. Optical Engineering, 2015, 55(1): 011008.
[15] KISHIDA K, LI C H. Pulse Pre-pump-BOTDA Technology for New Generation of Distributed Strain Measuring System. Japan: IEICE, 2004.
基金
浙江省水利厅科技计划项目(RA2103);国家自然科学基金项目(U2243223)
PDF(4344 KB)
