基于双脉冲探测的亚米级空间分辨率布里渊时域反射技术

在传统的布里渊光时域反射(BOTDR)技术中，空间分辨率和自发布里渊散射谱宽相互制约。针对这一问题，将探测光改进为超短双脉冲，并利用检测频谱包络的方法得到BOTDR系统的空间分辨率。该方法提高了BOTDR系统的空间分辨率，同时可避免压窄脉冲引起的布里渊增益谱展宽对测量精度的影响。实验表明，该方案能实现0.5 m空间分辨率的温度测量，避免自发布里渊散射谱发生较大展宽。

Abstract

In conventional Brillouin optical time domain reflectometry (BOTDR), mutual restraint between the spatial resolution and the width of spontaneous Brillouin scattering spectrum can not be avoided. To solve this problem, we ameliorated the approach using double ultra-short pulses as probe light. By detecting spectral envelope, the spatial resolution of BOTDR can be extracted. This method improves the spatial resolution of the BOTDR system and meanwhile avoids the influence of Brillouin gain spectrum broadening caused by narrowing pulse on measurement accuracy. The experimental results show that with this novel BOTDR system, the temperature measurement can be realized at a 0.5 m spatial resolution, and the large broadening of the spontaneous Brillouin scattering spectrum can be avoided.

参考文献

[1] Kurashima T, Horiguchi T, Tateda M. Thermal effects on the Brillouin frequency shift in jacketed optical silica fibers[J]. Applied Optics, 1990, 29(15): 2219-2222.

[2] 彭交波, 卞正兰, 郝蕴琦, 等. 用于布里渊分布式光纤传感的光学锁频系统[J]. 中国激光, 2012, 39(7): 0705001.

Peng Jiaobo, Bian Zhenglan, Hao Yunqi, et al. Frequency locking of two DFB lasers for distributed optical fiber sensing applications[J]. Chinese J Lasers, 2012, 39(7): 0705001.

[3] 赵晓东, 路元刚, 胡君辉, 等. 波长扫描型布里渊光时域反射仪[J]. 中国激光, 2012, 39(8): 0805003.

Zhao Xiaodong, Lu Yuangang, Hu Junhui, et al. A wavelength-scanning Brillouin optical time domain reflectometer[J]. Chinese J Lasers, 2012, 39(8): 0805003.

[4] 陈福昌, 胡佳成, 张承涛, 等. 基于高频微波技术的分布式布里渊光纤温度传感器[J]. 中国激光, 2012, 39(6): 0605009.

Chen Fuchang, Hu Jiacheng, Zhang Chengtao, et al. Distributed Brillouin optical fiber temperature sensor based on high frequency microwave technology[J]. Chinese J Lasers, 2012, 39(6): 0605009.

[5] 宋牟平, 励志成, 裘超. 50 km长距离布里渊光时域分析分布式光纤传感器[J]. 中国激光, 2010, 37(6): 1426-1429.

Song Muping, Li Zhicheng, Qiu Chao. A 50 km distributed optical fiber sensor based on Brillouin optical time-domain analyzer[J]. Chinese J Lasers, 2010, 37(6): 1426-1429.

[6] 洪小斌, 郭宏翔, 伍剑. 基于布里渊时域分析的分布式光纤传感入侵定位系统[J]. 中国激光, 2010, 37(4): 1037-1041.

Hong Xiaobin, Guo Hongxiang, Wu Jian. A Brillouin optical time domain analysis based distributed fiber optic intrusion sensor system[J]. Chinese J Lasers, 2010, 37(4): 1037-1041.

[7] Kurashima T, Horiguchi T. Brillouin optical-fiber time domain reflectometry[J]. IEICE Transactions on Communications, 1993, E76-B(4): 382-389.

[8] Horiguchi T, Tateda M. Optical-fiber attenuation investigation using stimulated Brillouin scattering between a pulse and a continuous wave[J]. Optics Letters, 1989, 14(8): 408-410.

[9] Fang Z J, Chin K, Qu R H, et al. Fundamentals of optical fiber sensors[M]. New Jersey: Wiley, 2012: 320-321.

[10] Kishida K, Li C H, Nishiguchi K. Pulse pre-pump method for cm-order spatial resolution of BOTDA[C]. SPIE, 2005, 5855: 559-562.

[11] Liang H, Li W, Linze N, et al. High-resolution DPP-BOTDA over 50 km LEAF using return-to-zero coded pulses[J]. Optics Letters, 2010, 35(10): 1503-1505.

[12] Nishiguchi K, Li C H, Guzik A, et al. Synthetic spectrum approach for Brillouin optical time-domain reflectometry[J]. Sensors, 2014, 14(3): 4731-4754.

[13] Koyamada Y, Sakairi Y, Takeuchi N, et al. Novel technique to improve spatial resolution in Brillouin optical time-domain reflectometry[J]. IEEE Photonics Technology Letters, 2008, 19(23): 1910-1912.

[14] Agrawa G P. Nonlinear fiber optics[M]. New York: Academic Press, 2013: 375-376.

盛志轩, 潘政清, 蔡海文, 曹玉龙, 王照勇, 庞拂飞. 基于双脉冲探测的亚米级空间分辨率布里渊时域反射技术[J]. 中国激光, 2016, 43(9): 0910004. Sheng Zhixuan, Pan Zhengqing, Cai Haiwen, Cao Yulong, Wang Zhaoyong, Pang Fufei. Brillouin Optical Time Domain Reflectometry with Sub-Meter Spatial Resolution Based on Double-Pulse Detection[J]. Chinese Journal of Lasers, 2016, 43(9): 0910004.

基于双脉冲探测的亚米级空间分辨率布里渊时域反射技术

关于本站 Cookie 的使用提示

全站搜索

基于双脉冲探测的亚米级空间分辨率布里渊时域反射技术

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索