长江科学院院报 ›› 2013, Vol. 30 ›› Issue (2): 92-96.DOI: 10.3969/j.issn.1001-5485.2013.02.020

• 安全监测预警专栏 • 上一篇    下一篇

基于拉曼散射的分布式光纤测温系统应用研究

黄祥1a,1b,1c，甘孝清1a,1b,1c，李强1a,1b,1c，曾祥进2   

  1. 1.长江科学院 a.工程安全与灾害防治研究所；b.水利部水工程安全与病害防治工程技术研究中心；c.国家大坝安全工程技术研究中心，武汉 430010； 2.武汉工程大学 计算机科学与工程学院，武汉 430205
  • 收稿日期:2012-03-11 修回日期:2012-09-28 出版日期:2013-02-01 发布日期:2013-02-06
  • 作者简介:黄 祥(1977-)，男，湖北孝感人，高级工程师，主要从事水利水电工程安全监测及研究工作
  • 基金资助:

    国家大坝安全工程技术研究中心课题（2011NDS005）;水利部948推广项目（201123）

Application of Distributed Optical Fiber Temperature Measuring System Based on Raman Scattering

HUANG Xiang1，GAN Xiao-qing1，LI Qiang1,  ZENG Xiang-jin2   

  1. 1. Yangtze River Scientific Research Institute, Wuhan 430010, China;2.School of Computer Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
  • Received:2012-03-11 Revised:2012-09-28 Online:2013-02-01 Published:2013-02-06

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摘要：

传统的水库水温监测将大坝上游坝面混凝土内部的点式温度测值近似为库水温度，存在一定的误差，且测点数量有限。基于拉曼散射的分布式光纤测温系统具有抗电磁干扰、抗腐蚀、电绝缘、高灵敏度、低成本以及可实现空间上连续分布测量等优点。从光时域反射、拉曼散射及散射光解调原理等方面研究了基于拉曼散射的分布式光纤测温系统的测温原理，并将该系统应用于长江三峡水利枢纽坝前库水温度监测中，对分布式光纤的布置、安装及观测等展开了研究。库水温度监测成果显示，三峡水库坝前库水温度沿水深方向的分布没有明显的分层现象，库水温度随气温变化而变化，最高库水平均温度约27℃，发生在8月，最低库水平均温度约10℃，发生在2月。基于拉曼散射的分布式光纤测温系统在三峡水利枢纽中的成功应用，表明该技术可以较好地应用于高坝大库的库水温度监测，具有一定的推广应用价值。

关键词: 拉曼散射, 分布式光纤, 光纤时域反射, 库水温度

Abstract:

By traditional method of monitoring reservoir water temperature, the concrete temperature on the upstream surface of dam (which is measured by point thermometer inside the concrete) is taken as the water temperature. Errors are caused and the gauging points are limited. On the contrary, the distributed optical fiber (DOF) temperature measuring temperature system based on Raman scattering has resistance to EMI (electromagnetic interference), resistance to corrosion, electric insulation, high sensitivity, low cost, and can implement continuous spatial distributed measurement. We have applied this measurement system to the Three Gorges reservoir water temperature monitoring and studied its principle from perspectives of Optical Time Domain Reflectrometry(OTDR), Raman Scattering and scattering-light demodulation. Monitoring results show that the reservoir water temperature in front of the Three Gorges dam varies with atmospheric temperature with no obvious stratification along the water depth direction. The maximum average temperature is nearly 27℃ in August and the minimum is 10℃ in February.  

Key words: Raman scattering, distributed optical fiber, OTDR, reservoir water temperature  

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