光学学报, 2018, 38 (3): 0328005, 网络出版: 2018-03-20
用于动态应变测量的快速分布式布里渊光纤传感 
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Fast Distributed Brillouin Optical Fiber Sensing for Dynamic Strain Measurement
图 & 表
图 1. 传统的BOTDA系统原理示意图。 (a)时域关系; (b)频域关系
Fig. 1. Schematic of classical BOTDA system. (a) Time-domain relationship; (b) frequency-domain relationship
图 2. 基于平衡探测和偏振消除的BOTDA系统的实验装置
Fig. 2. Experimental setup of BOTDA system with balanced detection and polarization noise elimination
图 3. 基于平衡探测和偏振消除的BOTDA系统的实验结果。 (a)单探测器获得的布里渊增益信号(蓝色)、单探测器获得的布里渊衰减信号(红色)、平衡探测器获得的合成布里渊信号(绿色); (b) 25 km处三种信号的局部放大图
Fig. 3. Experimental results of BOTDA system with balanced detection and polarization noise elimination. (a) Brillouin gain trace obtained using single-detector (blue), Brillouin attenuation trace obtained using single-detector (red), and synthetic Brillouin trace obtained using balanced-detector (green); (b) local large diagram of the three traces around 25 km
图 4. 基于偏振补偿的应变快速采集测量实验结果
Fig. 4. Experimental results of fast-acquisition measurement of the strain based on polarization compensation
图 5. 基于FAT的快速BOTDA系统原理示意图。 (a)探测光经过FAT调制; (b)抽运脉冲光经过FAT调制
Fig. 5. Schematic of fast BOTDA system based on FAT. (a) Probe wave modulated by FAT; (b) pump pulse modulated by FAT
图 7. 振动信号的测量。 (a)测量所得光纤振动截面BGS随时间的演进图; (b)应变的振动波形; (c)应变的振动波形功率谱
Fig. 7. Measurements of the vibration signals. (a) Evolution of the measured BGS of the vibrated section of fiber; (b) vibration waveforms of the strain; (c) power spectra of the vibration waveforms of the strain
图 8. 基于双调制方案的捷变频技术示意图
Fig. 8. Schematic of the frequency-agile technique based on dual-modulation scheme
图 9. SA-BOTDA系统原理示意图。 (a)斜坡法操作原理; (b)斜坡法和曲线拟合法应变振动波形测量的比较; (c)不同振动频率下谱域中的动态应变
Fig. 9. Schematic of SA-BOTDA system. (a) Operation principle of slope-assisted method; (b) comparison of strain vibration waveforms measured by slope-assisted method and curve fitting method; (c) dynamic strain in the spectral domain for different vibration frequencies
图 10. 多斜坡F-BOTDA系统原理示意图。 (a)多斜坡F-BOTDA的抽运光和探测光的频域关系,以及测量范围扩展的基本思路; (b)多斜坡F-BOTDA的抽运光和探测光的时域关系
Fig. 10. Schematic of multi-slope-assisted F-BOTDA system. (a) Frequency-domain relationship of pump and probe waves of multi-slope-assisted F-BOTDA, and basic idea of the extension of measurement range; (b) time-domain relationship of pump and probe waves of multi-slope-assisted F-BOTDA
图 11. 多斜坡法(蓝色实线)和传统曲线拟合法(红色虚线)所得BFS应变振动波形的实验测量结果,分别对应不同的扫频间隔。 (a) 20 MHz; (b) 40 MHz; (c) 60 MHz; (d) 80 MHz
Fig. 11. Experimental measurement results of BFS strain vibration waveforms obtained via multi-slope-assisted method (blue solid curve) and traditional curve-fitting method (red dotted curve) in varios frequency-intervals. (a) 20, (b) 40, (c) 60, and (d) 80 MHz
图 12. ΔνB=30 MHz时的归一化谱仿真图,抽运脉冲光脉宽从1 ns到连续光。 (a)归一化的BGS; (b)归一化的BPSS; (c)归一化的KS
Fig. 12. Simulation diagram of normalized spectra with the pump pulse width from 1 ns to continuous wave (ΔνB=30 MHz). (a) normalized BGS; (b) normalized BPSS; (c) normalized KS
图 13. 多频率方案抽运光和探测光的时域关系
Fig. 13. Time-domain relationship of pump wave and probe wave for multi-slope-assisted method
图 14. BFS应变振动波形的实验测量结果,其中两种参考波形分别为BGS曲线拟合所得参考波形(黑色散点)和KS曲线拟合所得参考波形(蓝色散点),多斜坡F-BOTDA系统解调所得应变振动波形(红色实线)分别对应不同的扫频间隔。 (a) 80 MHz; (b) 120 MHz; (c) 160 MHz; (d) 180 MHz
Fig. 14. Experimental results of BFS strain vibration waveforms, in which two kinds of reference strain vibration waveforms are curve-fitted based on the BGS (black scatter) and KS (blue scatter) respectively, meanwhile the strain vibration waveforms(red solid curve) are demodulated via F-BOTDA system in various frequency-intervals. (a) 80, (b) 120, (c) 160, and (d) 180 MHz
图 15. OCC-BOTDA系统原理示意图。 (a)时域关系; (b)频域关系
Fig. 15. Schematic of OCC-BOTDA system. (a) Time-domain relationship; (b) frequency-domain relationship
图 16. OCC-BOTDA系统对BGS的测量。 (a)单发抽运脉冲光即可测量分布式的BGS; (b)不同应变的改变量时的BGS
Fig. 16. Measurement of BGS via OCC-BOTDA system. (a) Distributed BGS measured by single shot of pump pulse wave; (b) various BGS for different strain changes
图 17. OCC-BOTDA系统对机械撞击的实验测量结果。(a)经过二次互相关算法处理后的BGS演进图; (b)解调出的应变振动波形
Fig. 17. Experimental results of mechanical shocks via OCC-BOTDA system. (a) Evolution of BGS processed by twice correlation algorithm; (b) demodulated strain vibration waveforms
图 18. OCC-BOTDA系统对快速开关事件的实验测量结果:算法处理后的BGS演进图。 (a)平均200次; (b)未加平均; (c)解调出的BFS的改变量与时间的关系
Fig. 18. Experimental results of the switch event via OCC-BOTDA system: evolution of BGS processed by twice correlation algorithm for various conditions. (a) 200 times averaging; (b) no averaging; (c) demodulated BFS changes over time
图 19. SF-BOTDA系统的演变与原理示意图。 (a)基于光学频率梳的BOTDA系统;(b)SF-BOTDA系统
Fig. 19. Schematic of SF-BOTDA system. (a) BOTDA system based on optical frequency comb; (b) SF-BOTDA system
图 20. 单发BOTDA系统原理示意图。 (a)频域中的OFDM信号的子载波; (b)双偏振双边带OFDM探测光;(c)抽运光和探测光的相互作用及布里渊谱型解调过程;(d)SBS过程中,BGS和BLS的示意图
Fig. 20. Schematic of single-shot BOTDA system. (a) Subcarriers of OFDM signal in frequency domain; (b) dual-polarized double-sideband OFDM probe; (c) pump and probe interaction and Brillouin spectrum extraction; (d) BGS and BLS after SBS process
图 21. 根据静态温度的测量实验结果重构的布里渊谱。 (a)x偏振态; (b)y偏振态; (c)双偏振相结合的情况; (d)在(c)中A、B、C三点的测量数据及其洛伦兹拟合曲线
Fig. 21. Reconstructed Brillouin spectrograms based on the measurement experimental results of static temperature. (a) x-polarization; (b) y-polarization; (c) combined dual-polarization; (d) measured data and Lorentzian fitting curves of marker A, B, C in (c)
周登望, 王本章, 巴德欣, 徐金龙, 徐鹏柏, 姜桃飞, 张东昱, 李惠, 董永康. 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. Zhou Dengwang, Wang Benzhang, Ba Dexin, Xu Jinlong, Xu Pengbai, Jiang Taofei, Zhang Dongyu, Li Hui, Dong Yongkang. Fast Distributed Brillouin Optical Fiber Sensing for Dynamic Strain Measurement[J]. Acta Optica Sinica, 2018, 38(3): 0328005.
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